Update the Supported Features markup file for RC2.
Update the Supported Features markup file for RC2.

* Adding table columns for Linux flavors.

shmao/wcf,StephenBonikowsky/wcf,dotnet/wcf,hongdai/wcf,mconnew/wcf,zhenlan/wcf,dotnet/wcf,khdang/wcf,ericstj/wcf,imcarolwang/wcf,ElJerry/wcf,MattGal/wcf,imcarolwang/wcf,imcarolwang/wcf,MattGal/wcf,ElJerry/wcf,mconnew/wcf,iamjasonp/wcf,mconnew/wcf,StephenBonikowsky/wcf,iamjasonp/wcf,khdang/wcf,KKhurin/wcf,shmao/wcf,hongdai/wcf,ericstj/wcf,KKhurin/wcf,zhenlan/wcf,dotnet/wcf