Update comments on variables thread safety
Update comments on variables thread safety

Vizerai/grpc,grpc/grpc,hstefan/grpc,vsco/grpc,geffzhang/grpc,firebase/grpc,Vizerai/grpc,yang-g/grpc,ctiller/grpc,dgquintas/grpc,ipylypiv/grpc,mehrdada/grpc,ctiller/grpc,deepaklukose/grpc,pszemus/grpc,Crevil/grpc,pszemus/grpc,muxi/grpc,philcleveland/grpc,nicolasnoble/grpc,philcleveland/grpc,ejona86/grpc,donnadionne/grpc,Crevil/grpc,jtattermusch/grpc,dgquintas/grpc,donnadionne/grpc,yongni/grpc,grpc/grpc,thinkerou/grpc,adelez/grpc,hstefan/grpc,kriswuollett/grpc,matt-kwong/grpc,philcleveland/grpc,yang-g/grpc,jboeuf/grpc,firebase/grpc,grpc/grpc,nicolasnoble/grpc,yongni/grpc,stanley-cheung/grpc,chrisdunelm/grpc,mehrdada/grpc,jboeuf/grpc,vsco/grpc,7anner/grpc,dgquintas/grpc,zhimingxie/grpc,vsco/grpc,deepaklukose/grpc,ctiller/grpc,makdharma/grpc,Vizerai/grpc,hstefan/grpc,yongni/grpc,ejona86/grpc,zhimingxie/grpc,kumaralokgithub/grpc,firebase/grpc,chrisdunelm/grpc,ncteisen/grpc,MakMukhi/grpc,Vizerai/grpc,thinkerou/grpc,zhimingxie/grpc,mehrdada/grpc,adelez/grpc,vjpai/grpc,grpc/grpc,ncteisen/grpc,ncteisen/grpc,quizlet/grpc,carl-mastrangelo/grpc,ncteisen/grpc,nicolasnoble/grpc,stanley-cheung/grpc,sreecha/grpc,yang-g/grpc,thinkerou/grpc,yang-g/grpc,MakMukhi/grpc,kumaralokgithub/grpc,fuchsia-mirror/third_party-grpc,ejona86/grpc,jtattermusch/grpc,fuchsia-mirror/third_party-grpc,carl-mastrangelo/grpc,murgatroid99/grpc,nicolasnoble/grpc,firebase/grpc,hstefan/grpc,ctiller/grpc,fuchsia-mirror/third_party-grpc,vsco/grpc,ejona86/grpc,geffzhang/grpc,deepaklukose/grpc,daniel-j-born/grpc,jtattermusch/grpc,msmania/grpc,simonkuang/grpc,matt-kwong/grpc,PeterFaiman/ruby-grpc-minimal,PeterFaiman/ruby-grpc-minimal,philcleveland/grpc,stanley-cheung/grpc,jboeuf/grpc,baylabs/grpc,stanley-cheung/grpc,ncteisen/grpc,kriswuollett/grpc,quizlet/grpc,murgatroid99/grpc,dgquintas/grpc,MakMukhi/grpc,pszemus/grpc,firebase/grpc,dgquintas/grpc,hstefan/grpc,makdharma/grpc,ctiller/grpc,jtattermusch/grpc,yang-g/grpc,7anner/grpc,fuchsia-mirror/third_party-grpc,jtattermusch/grpc,Crevil/grpc,yongni/grpc,muxi/grpc,nicolasnoble/grpc,kumaralokgithub/grpc,chrisdunelm/grpc,sreecha/grpc,jtattermusch/grpc,Vizerai/grpc,fuchsia-mirror/third_party-grpc,geffzhang/grpc,grpc/grpc,Vizerai/grpc,donnadionne/grpc,philcleveland/grpc,firebase/grpc,daniel-j-born/grpc,dgquintas/grpc,daniel-j-born/grpc,nicolasnoble/grpc,ctiller/grpc,msmania/grpc,thinkerou/grpc,pszemus/grpc,kskalski/grpc,grpc/grpc,geffzhang/grpc,kpayson64/grpc,grpc/grpc,thinkerou/grpc,baylabs/grpc,kumaralokgithub/grpc,adelez/grpc,zhimingxie/grpc,kriswuollett/grpc,kskalski/grpc,baylabs/grpc,yongni/grpc,muxi/grpc,murgatroid99/grpc,deepaklukose/grpc,MakMukhi/grpc,matt-kwong/grpc,kumaralokgithub/grpc,donnadionne/grpc,simonkuang/grpc,PeterFaiman/ruby-grpc-minimal,kumaralokgithub/grpc,chrisdunelm/grpc,carl-mastrangelo/grpc,geffzhang/grpc,carl-mastrangelo/grpc,grpc/grpc,sreecha/grpc,ctiller/grpc,Vizerai/grpc,ejona86/grpc,sreecha/grpc,7anner/grpc,quizlet/grpc,daniel-j-born/grpc,kskalski/grpc,adelez/grpc,MakMukhi/grpc,hstefan/grpc,hstefan/grpc,jboeuf/grpc,vsco/grpc,Crevil/grpc,vjpai/grpc,thinkerou/grpc,adelez/grpc,mehrdada/grpc,baylabs/grpc,donnadionne/grpc,kriswuollett/grpc,ejona86/grpc,matt-kwong/grpc,thinkerou/grpc,sreecha/grpc,jboeuf/grpc,mehrdada/grpc,hstefan/grpc,jtattermusch/grpc,mehrdada/grpc,daniel-j-born/grpc,ncteisen/grpc,simonkuang/grpc,quizlet/grpc,yongni/grpc,MakMukhi/grpc,PeterFaiman/ruby-grpc-minimal,vjpai/grpc,kpayson64/grpc,ncteisen/grpc,matt-kwong/grpc,yongni/grpc,firebase/grpc,yang-g/grpc,simonkuang/grpc,philcleveland/grpc,jtattermusch/grpc,kskalski/grpc,MakMukhi/grpc,makdharma/grpc,sreecha/grpc,chrisdunelm/grpc,nicolasnoble/grpc,jtattermusch/grpc,simonkuang/grpc,kpayson64/grpc,MakMukhi/grpc,carl-mastrangelo/grpc,Crevil/grpc,jboeuf/grpc,stanley-cheung/grpc,ncteisen/grpc,geffzhang/grpc,ncteisen/grpc,firebase/grpc,Vizerai/grpc,jboeuf/grpc,kskalski/grpc,yang-g/grpc,PeterFaiman/ruby-grpc-minimal,hstefan/grpc,pszemus/grpc,deepaklukose/grpc,msmania/grpc,kpayson64/grpc,adelez/grpc,kpayson64/grpc,vjpai/grpc,jboeuf/grpc,kriswuollett/grpc,muxi/grpc,carl-mastrangelo/grpc,geffzhang/grpc,msmania/grpc,kriswuollett/grpc,ipylypiv/grpc,Vizerai/grpc,msmania/grpc,deepaklukose/grpc,kriswuollett/grpc,nicolasnoble/grpc,7anner/grpc,yongni/grpc,vsco/grpc,vjpai/grpc,murgatroid99/grpc,carl-mastrangelo/grpc,carl-mastrangelo/grpc,baylabs/grpc,muxi/grpc,7anner/grpc,jboeuf/grpc,7anner/grpc,ejona86/grpc,fuchsia-mirror/third_party-grpc,grpc/grpc,pszemus/grpc,zhimingxie/grpc,stanley-cheung/grpc,muxi/grpc,kpayson64/grpc,firebase/grpc,msmania/grpc,vjpai/grpc,pszemus/grpc,zhimingxie/grpc,chrisdunelm/grpc,thinkerou/grpc,daniel-j-born/grpc,sreecha/grpc,mehrdada/grpc,chrisdunelm/grpc,chrisdunelm/grpc,sreecha/grpc,deepaklukose/grpc,baylabs/grpc,PeterFaiman/ruby-grpc-minimal,thinkerou/grpc,muxi/grpc,vjpai/grpc,yongni/grpc,quizlet/grpc,matt-kwong/grpc,fuchsia-mirror/third_party-grpc,vjpai/grpc,ctiller/grpc,makdharma/grpc,matt-kwong/grpc,murgatroid99/grpc,ipylypiv/grpc,carl-mastrangelo/grpc,sreecha/grpc,quizlet/grpc,ipylypiv/grpc,makdharma/grpc,adelez/grpc,muxi/grpc,carl-mastrangelo/grpc,stanley-cheung/grpc,grpc/grpc,kumaralokgithub/grpc,nicolasnoble/grpc,ejona86/grpc,donnadionne/grpc,stanley-cheung/grpc,philcleveland/grpc,Vizerai/grpc,ctiller/grpc,Crevil/grpc,pszemus/grpc,Crevil/grpc,murgatroid99/grpc,baylabs/grpc,makdharma/grpc,fuchsia-mirror/third_party-grpc,ncteisen/grpc,pszemus/grpc,muxi/grpc,kskalski/grpc,PeterFaiman/ruby-grpc-minimal,chrisdunelm/grpc,ejona86/grpc,thinkerou/grpc,daniel-j-born/grpc,jboeuf/grpc,msmania/grpc,firebase/grpc,vsco/grpc,carl-mastrangelo/grpc,sreecha/grpc,kriswuollett/grpc,mehrdada/grpc,deepaklukose/grpc,fuchsia-mirror/third_party-grpc,ipylypiv/grpc,quizlet/grpc,dgquintas/grpc,jtattermusch/grpc,Vizerai/grpc,pszemus/grpc,baylabs/grpc,nicolasnoble/grpc,dgquintas/grpc,chrisdunelm/grpc,philcleveland/grpc,7anner/grpc,baylabs/grpc,simonkuang/grpc,ctiller/grpc,yang-g/grpc,kpayson64/grpc,kriswuollett/grpc,sreecha/grpc,msmania/grpc,stanley-cheung/grpc,donnadionne/grpc,grpc/grpc,murgatroid99/grpc,PeterFaiman/ruby-grpc-minimal,ctiller/grpc,dgquintas/grpc,geffzhang/grpc,kpayson64/grpc,dgquintas/grpc,donnadionne/grpc,mehrdada/grpc,stanley-cheung/grpc,makdharma/grpc,kskalski/grpc,donnadionne/grpc,simonkuang/grpc,ipylypiv/grpc,7anner/grpc,PeterFaiman/ruby-grpc-minimal,carl-mastrangelo/grpc,Crevil/grpc,7anner/grpc,firebase/grpc,nicolasnoble/grpc,murgatroid99/grpc,donnadionne/grpc,quizlet/grpc,deepaklukose/grpc,jboeuf/grpc,vjpai/grpc,ctiller/grpc,adelez/grpc,kskalski/grpc,kpayson64/grpc,daniel-j-born/grpc,nicolasnoble/grpc,matt-kwong/grpc,makdharma/grpc,kumaralokgithub/grpc,vjpai/grpc,MakMukhi/grpc,murgatroid99/grpc,grpc/grpc,ejona86/grpc,daniel-j-born/grpc,quizlet/grpc,thinkerou/grpc,Crevil/grpc,jboeuf/grpc,ncteisen/grpc,vsco/grpc,murgatroid99/grpc,ejona86/grpc,fuchsia-mirror/third_party-grpc,ipylypiv/grpc,philcleveland/grpc,ncteisen/grpc,adelez/grpc,kumaralokgithub/grpc,simonkuang/grpc,mehrdada/grpc,msmania/grpc,vjpai/grpc,ejona86/grpc,PeterFaiman/ruby-grpc-minimal,matt-kwong/grpc,ipylypiv/grpc,mehrdada/grpc,mehrdada/grpc,muxi/grpc,kskalski/grpc,zhimingxie/grpc,makdharma/grpc,simonkuang/grpc,stanley-cheung/grpc,muxi/grpc,firebase/grpc,geffzhang/grpc,jtattermusch/grpc,donnadionne/grpc,vjpai/grpc,vsco/grpc,kpayson64/grpc,jtattermusch/grpc,chrisdunelm/grpc,stanley-cheung/grpc,kpayson64/grpc,pszemus/grpc,donnadionne/grpc,zhimingxie/grpc,ipylypiv/grpc,muxi/grpc,dgquintas/grpc,zhimingxie/grpc,pszemus/grpc,thinkerou/grpc,sreecha/grpc,yang-g/grpc