update release note
update release note

pascalberger/docfx,superyyrrzz/docfx,pascalberger/docfx,hellosnow/docfx,dotnet/docfx,928PJY/docfx,DuncanmaMSFT/docfx,dotnet/docfx,LordZoltan/docfx,DuncanmaMSFT/docfx,hellosnow/docfx,superyyrrzz/docfx,928PJY/docfx,928PJY/docfx,dotnet/docfx,LordZoltan/docfx,hellosnow/docfx,LordZoltan/docfx,superyyrrzz/docfx,LordZoltan/docfx,pascalberger/docfx