update document for dev-lang. (#1754)
update document for dev-lang. (#1754)


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