runtime/pprof: document content of heap profile
runtime/pprof: document content of heap profile

Fixes #11343.

Change-Id: I46efc24b687b9d060ad864fbb238c74544348e38
Reviewed-on: https://go-review.googlesource.com/12556
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

yasarkunduz/go,parkdy/go,donnel6809/go,mgyenik/go,codestation/go,suncycheng/go,constantine001/go,yasarkunduz/go,youprofit/go,goodlang/good,monetate/go,mbrukman/go,akutz/go,jmptrader/go,samanalysis/go,devpadawan/go,cookerzhu/go,Pulgafree/go,sosop/go,kakuhiroshi/go,xinhuang327/go,4ad/go,jonathanmarvens/go,greyhwndz/go,skatsuta/go,skotti/go,uileyar/go,jacobsa/go,CarterTsai/go,danielsoro/go,jacobsa/go,kevinc0825/go,alash3al/go,suncycheng/go,devpadawan/go,Pulgafree/go,momchil-velikov/go,NunoEdgarGub1/go,Badredapple/go,cookerzhu/go,theif519/go,JioCloud/go,beealone/go,jmptrader/go,danielsoro/go,XuYunnan/go,Stan-Lin-/go,jameskumar/go,Cofyc/go,vsdutka/go,qskycolor/go,mwhudson/go,danielsoro/go,jdeng/go,shazow/go,honsiorovskyi/go,g522342435/go,Badredapple/go,parkdy/go,akutz/go,derekmarcotte/go,Pulgafree/go,ericsnowcurrently/go,willjunspecial/go,ericsnowcurrently/go,theass/go,stormltf/go,malvira/go,xinhuang327/go,4ad/go,josharian/go,gdey/go,dpatel06/go,g522342435/go,jonathanmarvens/go,shazow/go,undergrowthlinear/go,linux-on-ibm-z/go,alash3al/go,mgyenik/go,akutz/go,jefby/go,parkdy/go,derekmarcotte/go,XuYunnan/go,skatsuta/go,ganboing/go-esx,Samurais/go,stormltf/go,xiaobodu/go,baiyunping333/go,alex-zhang/go,jonathanmarvens/go,jdhenke/go,odeke-em/go,CiscoCloud/go,JioCloud/go,parkdy/go,myPublicGit/go,Pulgafree/go,rentongzhang/go,sinuos/go,donnel6809/go,codestation/go,suncycheng/go,rachtsingh/gogojuice,zouchao2010/go,mwhudson/go,zouchao2010/go,shines77/go,cloudrain21/go,chinanjjohn2012/go,vishsingh/go,springning/go,nakedgc/go,miolini/go,WIZARD-CXY/go,ErikDubbelboer/go,jacobhaven/go,xiuzhifu/go,linux-on-ibm-z/go,vsdutka/go,gdey/go,ichu501/go,binarycrusader/go,kevinc0825/go,Cofyc/go,yuhengye/go,wangfakang/go-1,ericsnowcurrently/go,baiyunping333/go,CiscoCloud/go,ericsnowcurrently/go,mikekap/go,roth1002/go,jacobxk/go,samanalysis/go,Cofyc/go,snowsnail/go,CAFxX/go,constantine001/go,alash3al/go,CiscoCloud/go,slavau/go,kevinc0825/go,NichoZhang/go,polyverse-security/go,CAFxX/go,devpadawan/go,linux-on-ibm-z/go,danycoro/go,roth1002/go,zhangg/go,xinhuang327/go,myPublicGit/go,derekmarcotte/go,yangzhongj/go,ifagnosticism/go,jdhenke/go,zcwfeng/go,fjballest/golang,Young55555/go,yuhengye/go,mbrukman/go,Stan-Lin-/go,jonasi/go,zouchao2010/go,jonasi/go,rachtsingh/gogojuice,CiscoCloud/go,lihuanghai/go,cloudflare/go,vanloswang/go,ichu501/go,constantine001/go,stormltf/go,albertjin/golang-go,theass/go,CarterTsai/go,joshsammut/go,Stan-Lin-/go,zhangg/go,jefby/go,suncycheng/go,slavau/go,snowsnail/go,CiscoCloud/go,jdeng/go,skotti/go,jonathanmarvens/go,slavau/go,zhangg/go,dpatel06/go,Jordanzuo/go,yuhengye/go,rentongzhang/go,CAFxX/go,dafyddcrosby/go,arschles/golang-go,nawawi/go,vsekhar/elastic-go,gohin/go,jacobhaven/go,beealone/go,uileyar/go,b54898533/go,mdp/go,golang/go,g522342435/go,vsdutka/go,Cofyc/go,myPublicGit/go,donnel6809/go,odeke-em/go,mwhudson/go,jasonxiong/go,yasarkunduz/go,snowsnail/go,rentongzhang/go,jameskumar/go,famorted/go,wangfakang/go-1,ImJasonH/go,zcwfeng/go,xiaobodu/go,ErikDubbelboer/go,rachtsingh/gogojuice,josharian/go,NunoEdgarGub1/go,lihuanghai/go,dpatel06/go,xiuzhifu/go,stormltf/go,alex-zhang/go,zhangg/go,WIZARD-CXY/go,gohin/go,Jordanzuo/go,shines77/go,deft-code/go,danycoro/go,leeric92/go,mdp/go,CodyGuo/go,Charlesdong/go-1,b54898533/go,yuhengye/go,alash3al/go,mbrukman/go,rachtsingh/gogojuice,gohin/go,joshsammut/go,theass/go,xujianhai/go,binarycrusader/go,polyverse-security/go,suncycheng/go,goodlang/good,albertjin/golang-go,miolini/go,jonahglover/go,mdp/go,kevinc0825/go,CAFxX/go,jasonxiong/go,uileyar/go,josharian/go,springning/go,jacobsa/go,mikekap/go,jacobsa/go,cainiaocome/go,Samurais/go,ichu501/go,CAFxX/go,jacobxk/go,cookerzhu/go,kakuhiroshi/go,jasonxiong/go,g522342435/go,ObjectiveJoe/go,willjunspecial/go,skotti/go,arschles/go-1,kim-racktop/go,arschles/go-1,AALEKH/go,dterei/go,shines77/go,parkdy/go,vsekhar/elastic-go,ganboing/go-esx,willjunspecial/go,kevinc0825/go,alex-zhang/go,momchil-velikov/go,suncycheng/go,fjballest/golang,qskycolor/go,Stan-Lin-/go,donnel6809/go,vanloswang/go,xujianhai/go,polyverse-security/go,dafyddcrosby/go,myPublicGit/go,xiaobodu/go,fjballest/golang,4ad/go,mikekap/go,jdhenke/go,akutz/go,NunoEdgarGub1/go,gdey/go,golang/go,samanalysis/go,leeric92/go,wangfakang/go-1,famorted/go,jacobhaven/go,NichoZhang/go,linux-on-ibm-z/go,cloudflare/go,ImJasonH/go,honsiorovskyi/go,jacobxk/go,nawawi/go,jefby/go,malvira/go,cyberroadie/go,leeric92/go,WIZARD-CXY/go,xinhuang327/go,donnel6809/go,chinanjjohn2012/go,stormltf/go,christopher-henderson/Go,danycoro/go,JioCloud/go,yuhengye/go,skotti/go,CarterTsai/go,miolini/go,sndnvaps/go,XuYunnan/go,b54898533/go,vsekhar/elastic-go,binarycrusader/go,jacobxk/go,dpatel06/go,malvira/go,cloudrain21/go,leeric92/go,g522342435/go,GeorgiCodes/go,zouchao2010/go,momchil-velikov/go,youprofit/go,nakedgc/go,Samurais/go,ganboing/go-esx,ErikDubbelboer/go,CarterTsai/go,greyhwndz/go,arschles/go-1,CodyGuo/go,AALEKH/go,beealone/go,mbrukman/go,Charlesdong/go-1,polyverse-security/go,golang/go,derekmarcotte/go,Pulgafree/go,ImJasonH/go,vishsingh/go,monetate/go,alash3al/go,cyberroadie/go,goodlang/good,yangzhongj/go,codestation/go,gdey/go,ObjectiveJoe/go,ichu501/go,Charlesdong/go-1,vishsingh/go,dterei/go,binarycrusader/go,chinanjjohn2012/go,nakedgc/go,Charlesdong/go-1,baiyunping333/go,XuYunnan/go,devpadawan/go,cloudflare/go,jacobxk/go,zouchao2010/go,sndnvaps/go,Endika/go,monetate/go,ifagnosticism/go,golang/go,donnel6809/go,Samurais/go,mbrukman/go,Young55555/go,Stan-Lin-/go,malvira/go,GeorgiCodes/go,Endika/go,AALEKH/go,gohin/go,g522342435/go,Jordanzuo/go,joshsammut/go,mbrukman/go,willjunspecial/go,linux-on-ibm-z/go,baiyunping333/go,theass/go,Jordanzuo/go,samanalysis/go,polyverse-security/go,monetate/go,gohin/go,alex-zhang/go,jacobhaven/go,willjunspecial/go,xiaobodu/go,vanloswang/go,zouchao2010/go,stormltf/go,cloudrain21/go,dterei/go,CarterTsai/go,xiaobodu/go,jdhenke/go,undergrowthlinear/go,mbrukman/go,mdp/go,ifagnosticism/go,shines77/go,deft-code/go,miolini/go,parkdy/go,joshsammut/go,shazow/go,wangfakang/go-1,xujianhai/go,sinuos/go,NichoZhang/go,jasonxiong/go,goodlang/good,mwhudson/go,alex-zhang/go,Endika/go,Stan-Lin-/go,danielsoro/go,zhangg/go,jameskumar/go,ganboing/go-esx,danielsoro/go,ErikDubbelboer/go,odeke-em/go,Jordanzuo/go,josharian/go,dafyddcrosby/go,kim-racktop/go,gdey/go,jonahglover/go,cloudflare/go,mbrukman/go,ganboing/go-esx,mgyenik/go,sinuos/go,jasonxiong/go,undergrowthlinear/go,mikekap/go,wangfakang/go-1,cookerzhu/go,CodyGuo/go,honsiorovskyi/go,alash3al/go,fjballest/golang,sosop/go,slavau/go,skotti/go,g522342435/go,ichu501/go,arschles/go-1,Charlesdong/go-1,skatsuta/go,binarycrusader/go,cloudrain21/go,deft-code/go,kevinc0825/go,vishsingh/go,yangzhongj/go,AALEKH/go,ifagnosticism/go,famorted/go,nawawi/go,danycoro/go,jonasi/go,cyberroadie/go,constantine001/go,golang/go,Badredapple/go,alex-zhang/go,NichoZhang/go,ImJasonH/go,ImJasonH/go,stormltf/go,akutz/go,odeke-em/go,cyberroadie/go,constantine001/go,NunoEdgarGub1/go,mgyenik/go,likesea/go,sosop/go,mgyenik/go,GeorgiCodes/go,josharian/go,chinanjjohn2012/go,binarycrusader/go,deft-code/go,kim-racktop/go,danycoro/go,xujianhai/go,youprofit/go,devpadawan/go,polyverse-security/go,Stan-Lin-/go,jdeng/go,danycoro/go,jdeng/go,Young55555/go,ErikDubbelboer/go,arschles/golang-go,gohin/go,rentongzhang/go,parkdy/go,ObjectiveJoe/go,likesea/go,dafyddcrosby/go,xiaobodu/go,linux-on-ibm-z/go,snowsnail/go,theass/go,jacobsa/go,josharian/go,vsdutka/go,arschles/go-1,CodyGuo/go,NunoEdgarGub1/go,samanalysis/go,deft-code/go,Pulgafree/go,arschles/golang-go,jefby/go,jacobsa/go,AALEKH/go,honsiorovskyi/go,theass/go,constantine001/go,xinhuang327/go,CodyGuo/go,famorted/go,Young55555/go,jdhenke/go,albertjin/golang-go,slavau/go,cainiaocome/go,Cofyc/go,WIZARD-CXY/go,NunoEdgarGub1/go,codestation/go,shines77/go,monetate/go,cloudrain21/go,b54898533/go,vanloswang/go,zhangg/go,XuYunnan/go,mikekap/go,springning/go,kim-racktop/go,xiuzhifu/go,slavau/go,jonahglover/go,famorted/go,ifagnosticism/go,snowsnail/go,dpatel06/go,rentongzhang/go,jonahglover/go,akutz/go,danielsoro/go,skatsuta/go,jameskumar/go,JioCloud/go,Young55555/go,xujianhai/go,vishsingh/go,jonathanmarvens/go,theif519/go,NichoZhang/go,Jordanzuo/go,AALEKH/go,nawawi/go,vsdutka/go,andrewchambers/go,constantine001/go,theif519/go,alash3al/go,qskycolor/go,CarterTsai/go,qskycolor/go,AALEKH/go,vsdutka/go,roth1002/go,greyhwndz/go,mwhudson/go,famorted/go,binarycrusader/go,polyverse-security/go,skatsuta/go,likesea/go,cloudrain21/go,nawawi/go,akutz/go,shines77/go,theass/go,akutz/go,donnel6809/go,rentongzhang/go,XuYunnan/go,beealone/go,danycoro/go,deft-code/go,kakuhiroshi/go,yangzhongj/go,ObjectiveJoe/go,jdeng/go,GeorgiCodes/go,CarterTsai/go,kevinc0825/go,ifagnosticism/go,dpatel06/go,Endika/go,CAFxX/go,honsiorovskyi/go,famorted/go,ericsnowcurrently/go,shazow/go,sosop/go,greyhwndz/go,yuhengye/go,ifagnosticism/go,deft-code/go,suncycheng/go,Endika/go,cloudflare/go,shazow/go,Cofyc/go,kevinc0825/go,xiuzhifu/go,jacobhaven/go,momchil-velikov/go,joshsammut/go,greyhwndz/go,jefby/go,dpatel06/go,youprofit/go,likesea/go,cookerzhu/go,CAFxX/go,malvira/go,mikekap/go,CodyGuo/go,cyberroadie/go,Jordanzuo/go,vsekhar/elastic-go,zcwfeng/go,fjballest/golang,baiyunping333/go,mdp/go,jasonxiong/go,kakuhiroshi/go,lihuanghai/go,Samurais/go,jonahglover/go,skatsuta/go,zcwfeng/go,sndnvaps/go,goodlang/good,nawawi/go,ObjectiveJoe/go,golang/go,GeorgiCodes/go,cyberroadie/go,Cofyc/go,lihuanghai/go,ErikDubbelboer/go,WIZARD-CXY/go,binarycrusader/go,jonahglover/go,ObjectiveJoe/go,jonathanmarvens/go,malvira/go,jameskumar/go,yuhengye/go,qskycolor/go,derekmarcotte/go,albertjin/golang-go,dafyddcrosby/go,albertjin/golang-go,samanalysis/go,Badredapple/go,malvira/go,jonathanmarvens/go,ganboing/go-esx,xinhuang327/go,kakuhiroshi/go,andrewchambers/go,wangfakang/go-1,odeke-em/go,myPublicGit/go,springning/go,arschles/go-1,jasonxiong/go,mwhudson/go,skatsuta/go,shines77/go,cookerzhu/go,linux-on-ibm-z/go,GeorgiCodes/go,nakedgc/go,devpadawan/go,JioCloud/go,rachtsingh/gogojuice,odeke-em/go,dafyddcrosby/go,yangzhongj/go,cyberroadie/go,albertjin/golang-go,cainiaocome/go,willjunspecial/go,roth1002/go,nawawi/go,gohin/go,arschles/golang-go,devpadawan/go,sndnvaps/go,greyhwndz/go,jefby/go,undergrowthlinear/go,cloudrain21/go,jefby/go,sosop/go,skotti/go,g522342435/go,ganboing/go-esx,cookerzhu/go,zouchao2010/go,Charlesdong/go-1,likesea/go,sinuos/go,kakuhiroshi/go,fjballest/golang,JioCloud/go,zcwfeng/go,Samurais/go,Endika/go,uileyar/go,golang/go,CAFxX/go,rentongzhang/go,mikekap/go,jmptrader/go,Pulgafree/go,baiyunping333/go,gdey/go,sinuos/go,samanalysis/go,arschles/go-1,leeric92/go,mwhudson/go,sosop/go,vsekhar/elastic-go,arschles/golang-go,greyhwndz/go,danielsoro/go,arschles/golang-go,xiuzhifu/go,snowsnail/go,roth1002/go,jacobhaven/go,kakuhiroshi/go,jacobxk/go,youprofit/go,sndnvaps/go,Samurais/go,jonahglover/go,jonathanmarvens/go,fjballest/golang,cainiaocome/go,jacobhaven/go,andrewchambers/go,qskycolor/go,jmptrader/go,uileyar/go,mdp/go,Samurais/go,xiuzhifu/go,codestation/go,nakedgc/go,mwhudson/go,b54898533/go,stormltf/go,theif519/go,ichu501/go,vanloswang/go,miolini/go,skotti/go,jmptrader/go,gohin/go,Charlesdong/go-1,ObjectiveJoe/go,xiuzhifu/go,zcwfeng/go,leeric92/go,likesea/go,rentongzhang/go,xiaobodu/go,vsekhar/elastic-go,honsiorovskyi/go,likesea/go,kim-racktop/go,odeke-em/go,leeric92/go,zhangg/go,springning/go,odeke-em/go,goodlang/good,WIZARD-CXY/go,fjballest/golang,chinanjjohn2012/go,CodyGuo/go,vsdutka/go,jacobxk/go,cyberroadie/go,jonasi/go,youprofit/go,shazow/go,sosop/go,ichu501/go,yasarkunduz/go,jdhenke/go,roth1002/go,wangfakang/go-1,Cofyc/go,jonasi/go,dpatel06/go,codestation/go,slavau/go,snowsnail/go,beealone/go,willjunspecial/go,parkdy/go,uileyar/go,ericsnowcurrently/go,lihuanghai/go,dterei/go,dterei/go,arschles/golang-go,famorted/go,lihuanghai/go,jonahglover/go,undergrowthlinear/go,miolini/go,shazow/go,willjunspecial/go,jdhenke/go,vsekhar/elastic-go,sndnvaps/go,kim-racktop/go,honsiorovskyi/go,jacobhaven/go,qskycolor/go,chinanjjohn2012/go,likesea/go,vishsingh/go,undergrowthlinear/go,mgyenik/go,lihuanghai/go,cainiaocome/go,cloudrain21/go,shazow/go,JioCloud/go,codestation/go,alash3al/go,CarterTsai/go,kim-racktop/go,donnel6809/go,snowsnail/go,mgyenik/go,springning/go,sndnvaps/go,ErikDubbelboer/go,vanloswang/go,yangzhongj/go,beealone/go,andrewchambers/go,alex-zhang/go,rachtsingh/gogojuice,honsiorovskyi/go,youprofit/go,sosop/go,Endika/go,monetate/go,NunoEdgarGub1/go,ganboing/go-esx,momchil-velikov/go,vishsingh/go,Badredapple/go,jonasi/go,devpadawan/go,joshsammut/go,josharian/go,joshsammut/go,Badredapple/go,lihuanghai/go,nawawi/go,ErikDubbelboer/go,ObjectiveJoe/go,jameskumar/go,golang/go,ImJasonH/go,vishsingh/go,xinhuang327/go,4ad/go,theif519/go,skatsuta/go,xinhuang327/go,leeric92/go,Young55555/go,miolini/go,dterei/go,b54898533/go,zouchao2010/go,sinuos/go,jdhenke/go,jameskumar/go,xiuzhifu/go,ifagnosticism/go,andrewchambers/go,yasarkunduz/go,cainiaocome/go,xiaobodu/go,skotti/go,sndnvaps/go,ichu501/go,JioCloud/go,cookerzhu/go,joshsammut/go,4ad/go,NichoZhang/go,cainiaocome/go,Badredapple/go,vanloswang/go,linux-on-ibm-z/go,greyhwndz/go,deft-code/go,yasarkunduz/go,ImJasonH/go,mdp/go,rachtsingh/gogojuice,jmptrader/go,jdeng/go,myPublicGit/go,arschles/go-1,albertjin/golang-go,undergrowthlinear/go,mikekap/go,dterei/go,cainiaocome/go,Endika/go,AALEKH/go,xujianhai/go,monetate/go,jacobxk/go,monetate/go,youprofit/go,Stan-Lin-/go,4ad/go,vsdutka/go,yasarkunduz/go,yuhengye/go,momchil-velikov/go,shines77/go,roth1002/go,ericsnowcurrently/go,kim-racktop/go,dterei/go,jmptrader/go,Jordanzuo/go,jonasi/go,WIZARD-CXY/go,undergrowthlinear/go,zhangg/go,gdey/go,jacobsa/go,CodyGuo/go,miolini/go,alex-zhang/go,jdeng/go,rachtsingh/gogojuice,myPublicGit/go,baiyunping333/go,slavau/go,samanalysis/go,derekmarcotte/go,jmptrader/go,polyverse-security/go,yangzhongj/go,jacobsa/go,theass/go,vsekhar/elastic-go,4ad/go,Pulgafree/go,danycoro/go,derekmarcotte/go,malvira/go,b54898533/go,GeorgiCodes/go,arschles/golang-go,Young55555/go,ericsnowcurrently/go,mgyenik/go,yasarkunduz/go,yangzhongj/go,chinanjjohn2012/go,constantine001/go,Badredapple/go,mdp/go,vanloswang/go,4ad/go,springning/go,nakedgc/go,springning/go,jameskumar/go,codestation/go,andrewchambers/go,theif519/go,roth1002/go,CiscoCloud/go,XuYunnan/go,beealone/go,theif519/go,goodlang/good,CiscoCloud/go,GeorgiCodes/go,dafyddcrosby/go,momchil-velikov/go,XuYunnan/go,andrewchambers/go,myPublicGit/go,b54898533/go,nakedgc/go,cloudflare/go,ImJasonH/go,jasonxiong/go,dafyddcrosby/go,cloudflare/go,xujianhai/go,jefby/go,goodlang/good,nakedgc/go,theif519/go,gdey/go,Young55555/go,kakuhiroshi/go,beealone/go,NichoZhang/go,uileyar/go,danielsoro/go,baiyunping333/go,suncycheng/go,josharian/go,xujianhai/go,zcwfeng/go,andrewchambers/go,uileyar/go,NunoEdgarGub1/go,zcwfeng/go,cloudflare/go,sinuos/go,derekmarcotte/go,momchil-velikov/go,sinuos/go,NichoZhang/go,CiscoCloud/go,Charlesdong/go-1,jdeng/go,albertjin/golang-go,wangfakang/go-1,chinanjjohn2012/go,qskycolor/go,jonasi/go,WIZARD-CXY/go