Info the fallback message instead of warning (#967)
Info the fallback message instead of warning (#967)


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