cmd/cgo: final docs for pointer passing
cmd/cgo: final docs for pointer passing

Update #12416.

Change-Id: I39eb0d1090c08ef9be9dc38d27abab62672cf664
Reviewed-on: https://go-review.googlesource.com/17064
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

josharian/go,cyberroadie/go,4ad/go,odeke-em/go,linux-on-ibm-z/go,linux-on-ibm-z/go,codestation/go,miolini/go,sndnvaps/go,sndnvaps/go,miolini/go,miolini/go,kim-racktop/go,CAFxX/go,Samurais/go,Samurais/go,linux-on-ibm-z/go,binarycrusader/go,fjballest/golang,Samurais/go,odeke-em/go,akutz/go,josharian/go,vanloswang/go,golang/go,Cofyc/go,ganboing/go-esx,roth1002/go,suncycheng/go,cyberroadie/go,fjballest/golang,vsekhar/elastic-go,4ad/go,fjballest/golang,cyberroadie/go,derekmarcotte/go,sndnvaps/go,Jordanzuo/go,josharian/go,vsekhar/elastic-go,Cofyc/go,Cofyc/go,momchil-velikov/go,CAFxX/go,binarycrusader/go,CAFxX/go,mwhudson/go,Cofyc/go,goodlang/good,deft-code/go,fjballest/golang,vsekhar/elastic-go,kim-racktop/go,4ad/go,derekmarcotte/go,suncycheng/go,vanloswang/go,ganboing/go-esx,golang/go,goodlang/good,ganboing/go-esx,odeke-em/go,4ad/go,josharian/go,codestation/go,vanloswang/go,cloudflare/go,nawawi/go,linux-on-ibm-z/go,mwhudson/go,theif519/go,Samurais/go,nawawi/go,ImJasonH/go,christopher-henderson/Go,deft-code/go,codestation/go,momchil-velikov/go,Endika/go,deft-code/go,mwhudson/go,kim-racktop/go,suncycheng/go,roth1002/go,polyverse-security/go,derekmarcotte/go,miolini/go,deft-code/go,sndnvaps/go,josharian/go,Endika/go,ImJasonH/go,cyberroadie/go,mwhudson/go,fjballest/golang,vanloswang/go,Jordanzuo/go,Jordanzuo/go,cloudflare/go,vanloswang/go,vsekhar/elastic-go,goodlang/good,akutz/go,cyberroadie/go,roth1002/go,deft-code/go,odeke-em/go,ganboing/go-esx,4ad/go,polyverse-security/go,roth1002/go,miolini/go,kim-racktop/go,derekmarcotte/go,akutz/go,CAFxX/go,cloudflare/go,Jordanzuo/go,ganboing/go-esx,vsekhar/elastic-go,theif519/go,polyverse-security/go,sndnvaps/go,ImJasonH/go,Endika/go,sndnvaps/go,roth1002/go,polyverse-security/go,binarycrusader/go,momchil-velikov/go,golang/go,vsekhar/elastic-go,josharian/go,mwhudson/go,goodlang/good,codestation/go,sndnvaps/go,nawawi/go,polyverse-security/go,codestation/go,fjballest/golang,goodlang/good,deft-code/go,vanloswang/go,4ad/go,ganboing/go-esx,CAFxX/go,Jordanzuo/go,codestation/go,ImJasonH/go,fjballest/golang,linux-on-ibm-z/go,golang/go,theif519/go,Jordanzuo/go,theif519/go,vsekhar/elastic-go,polyverse-security/go,binarycrusader/go,theif519/go,cloudflare/go,nawawi/go,vanloswang/go,josharian/go,momchil-velikov/go,roth1002/go,goodlang/good,Cofyc/go,sndnvaps/go,Endika/go,suncycheng/go,cloudflare/go,Samurais/go,Jordanzuo/go,4ad/go,Samurais/go,mwhudson/go,derekmarcotte/go,miolini/go,linux-on-ibm-z/go,miolini/go,goodlang/good,vsekhar/elastic-go,nawawi/go,fjballest/golang,mwhudson/go,CAFxX/go,deft-code/go,polyverse-security/go,Endika/go,golang/go,kim-racktop/go,cloudflare/go,odeke-em/go,Endika/go,roth1002/go,theif519/go,ganboing/go-esx,suncycheng/go,ImJasonH/go,binarycrusader/go,akutz/go,suncycheng/go,derekmarcotte/go,codestation/go,theif519/go,odeke-em/go,binarycrusader/go,kim-racktop/go,Samurais/go,Endika/go,Cofyc/go,josharian/go,Cofyc/go,miolini/go,akutz/go,nawawi/go,4ad/go,momchil-velikov/go,kim-racktop/go,vanloswang/go,kim-racktop/go,roth1002/go,golang/go,derekmarcotte/go,akutz/go,CAFxX/go,mwhudson/go,CAFxX/go,momchil-velikov/go,momchil-velikov/go,deft-code/go,linux-on-ibm-z/go,codestation/go,akutz/go,polyverse-security/go,Cofyc/go,cyberroadie/go,momchil-velikov/go,ganboing/go-esx,linux-on-ibm-z/go,nawawi/go,binarycrusader/go,ImJasonH/go,suncycheng/go,Jordanzuo/go,cyberroadie/go,ImJasonH/go,golang/go,akutz/go,cyberroadie/go,cloudflare/go,odeke-em/go,suncycheng/go,cloudflare/go,binarycrusader/go,odeke-em/go,goodlang/good,golang/go,ImJasonH/go,theif519/go,derekmarcotte/go,Endika/go,Samurais/go,nawawi/go