Update SupportedFeatures-v2.0.md
Update SupportedFeatures-v2.0.md

* Split SPNIdentity to SPNIdentity/TCP and SPNIdentity/HTTP.
* Update UPNIdentity row per testing result.
KKhurin/wcf,zhenlan/wcf,imcarolwang/wcf,hongdai/wcf,hongdai/wcf,imcarolwang/wcf,ericstj/wcf,StephenBonikowsky/wcf,mconnew/wcf,StephenBonikowsky/wcf,zhenlan/wcf,dotnet/wcf,mconnew/wcf,imcarolwang/wcf,mconnew/wcf,ericstj/wcf,KKhurin/wcf,dotnet/wcf,dotnet/wcf