Fixes to source generator documentation (#11855)
Fixes to source generator documentation (#11855)

* Fixes to source generator documentation

* Add feature flag info.

* Remove extraneous sentence

jamesqo/roslyn,tmat/roslyn,physhi/roslyn,CyrusNajmabadi/roslyn,diryboy/roslyn,tvand7093/roslyn,orthoxerox/roslyn,natidea/roslyn,ljw1004/roslyn,balajikris/roslyn,Pvlerick/roslyn,tvand7093/roslyn,xoofx/roslyn,akrisiun/roslyn,xasx/roslyn,jhendrixMSFT/roslyn,a-ctor/roslyn,jmarolf/roslyn,lorcanmooney/roslyn,paulvanbrenk/roslyn,mgoertz-msft/roslyn,jaredpar/roslyn,eriawan/roslyn,mavasani/roslyn,amcasey/roslyn,brettfo/roslyn,reaction1989/roslyn,jasonmalinowski/roslyn,DustinCampbell/roslyn,gafter/roslyn,pdelvo/roslyn,davkean/roslyn,abock/roslyn,heejaechang/roslyn,ErikSchierboom/roslyn,agocke/roslyn,kelltrick/roslyn,gafter/roslyn,eriawan/roslyn,DustinCampbell/roslyn,heejaechang/roslyn,jaredpar/roslyn,MattWindsor91/roslyn,MattWindsor91/roslyn,VSadov/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,robinsedlaczek/roslyn,shyamnamboodiripad/roslyn,KevinH-MS/roslyn,nguerrera/roslyn,mmitche/roslyn,KevinH-MS/roslyn,reaction1989/roslyn,jmarolf/roslyn,heejaechang/roslyn,tannergooding/roslyn,dotnet/roslyn,jeffanders/roslyn,Hosch250/roslyn,TyOverby/roslyn,KevinRansom/roslyn,Shiney/roslyn,AArnott/roslyn,sharwell/roslyn,abock/roslyn,tmeschter/roslyn,dotnet/roslyn,KiloBravoLima/roslyn,cston/roslyn,CaptainHayashi/roslyn,KevinRansom/roslyn,swaroop-sridhar/roslyn,bartdesmet/roslyn,michalhosala/roslyn,stephentoub/roslyn,bartdesmet/roslyn,drognanar/roslyn,DustinCampbell/roslyn,agocke/roslyn,tmeschter/roslyn,eriawan/roslyn,tannergooding/roslyn,vslsnap/roslyn,panopticoncentral/roslyn,natidea/roslyn,dotnet/roslyn,a-ctor/roslyn,michalhosala/roslyn,akrisiun/roslyn,ljw1004/roslyn,stephentoub/roslyn,brettfo/roslyn,physhi/roslyn,ErikSchierboom/roslyn,zooba/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,diryboy/roslyn,KevinH-MS/roslyn,AlekseyTs/roslyn,yeaicc/roslyn,michalhosala/roslyn,vslsnap/roslyn,jcouv/roslyn,dpoeschl/roslyn,AmadeusW/roslyn,OmarTawfik/roslyn,Pvlerick/roslyn,mavasani/roslyn,TyOverby/roslyn,sharwell/roslyn,jmarolf/roslyn,AArnott/roslyn,KevinRansom/roslyn,panopticoncentral/roslyn,abock/roslyn,robinsedlaczek/roslyn,jamesqo/roslyn,AnthonyDGreen/roslyn,ljw1004/roslyn,mmitche/roslyn,lorcanmooney/roslyn,diryboy/roslyn,CaptainHayashi/roslyn,bbarry/roslyn,orthoxerox/roslyn,weltkante/roslyn,kelltrick/roslyn,nguerrera/roslyn,KiloBravoLima/roslyn,mattscheffer/roslyn,mattwar/roslyn,balajikris/roslyn,lorcanmooney/roslyn,shyamnamboodiripad/roslyn,MichalStrehovsky/roslyn,TyOverby/roslyn,jkotas/roslyn,dpoeschl/roslyn,yeaicc/roslyn,Giftednewt/roslyn,MichalStrehovsky/roslyn,pdelvo/roslyn,sharwell/roslyn,gafter/roslyn,jasonmalinowski/roslyn,bkoelman/roslyn,zooba/roslyn,Hosch250/roslyn,AmadeusW/roslyn,paulvanbrenk/roslyn,VSadov/roslyn,a-ctor/roslyn,jcouv/roslyn,yeaicc/roslyn,xasx/roslyn,KirillOsenkov/roslyn,cston/roslyn,natidea/roslyn,robinsedlaczek/roslyn,tvand7093/roslyn,stephentoub/roslyn,jamesqo/roslyn,jcouv/roslyn,Shiney/roslyn,mavasani/roslyn,budcribar/roslyn,AlekseyTs/roslyn,MichalStrehovsky/roslyn,wvdd007/roslyn,orthoxerox/roslyn,aelij/roslyn,jaredpar/roslyn,jhendrixMSFT/roslyn,genlu/roslyn,Pvlerick/roslyn,mmitche/roslyn,jhendrixMSFT/roslyn,panopticoncentral/roslyn,leppie/roslyn,agocke/roslyn,AlekseyTs/roslyn,zooba/roslyn,mattwar/roslyn,davkean/roslyn,mgoertz-msft/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,xoofx/roslyn,drognanar/roslyn,tannergooding/roslyn,reaction1989/roslyn,leppie/roslyn,jeffanders/roslyn,bbarry/roslyn,genlu/roslyn,AnthonyDGreen/roslyn,MatthieuMEZIL/roslyn,KirillOsenkov/roslyn,jkotas/roslyn,jkotas/roslyn,xoofx/roslyn,mattscheffer/roslyn,balajikris/roslyn,vslsnap/roslyn,pdelvo/roslyn,amcasey/roslyn,swaroop-sridhar/roslyn,nguerrera/roslyn,Giftednewt/roslyn,Giftednewt/roslyn,srivatsn/roslyn,shyamnamboodiripad/roslyn,khyperia/roslyn,ErikSchierboom/roslyn,bkoelman/roslyn,tmat/roslyn,OmarTawfik/roslyn,weltkante/roslyn,MatthieuMEZIL/roslyn,VSadov/roslyn,wvdd007/roslyn,amcasey/roslyn,AmadeusW/roslyn,CyrusNajmabadi/roslyn,weltkante/roslyn,bkoelman/roslyn,physhi/roslyn,Shiney/roslyn,CyrusNajmabadi/roslyn,leppie/roslyn,mattscheffer/roslyn,drognanar/roslyn,budcribar/roslyn,cston/roslyn,aelij/roslyn,brettfo/roslyn,paulvanbrenk/roslyn,khyperia/roslyn,aelij/roslyn,AArnott/roslyn,jasonmalinowski/roslyn,CaptainHayashi/roslyn,MattWindsor91/roslyn,budcribar/roslyn,wvdd007/roslyn,genlu/roslyn,Hosch250/roslyn,AnthonyDGreen/roslyn,mgoertz-msft/roslyn,dpoeschl/roslyn,bbarry/roslyn,MatthieuMEZIL/roslyn,jeffanders/roslyn,KiloBravoLima/roslyn,KirillOsenkov/roslyn,kelltrick/roslyn,khyperia/roslyn,davkean/roslyn,bartdesmet/roslyn,OmarTawfik/roslyn,tmeschter/roslyn,MattWindsor91/roslyn,srivatsn/roslyn,xasx/roslyn,srivatsn/roslyn,tmat/roslyn,mattwar/roslyn,swaroop-sridhar/roslyn,akrisiun/roslyn