fix title's weird mark css style
fix title's weird mark css style

LordZoltan/docfx,928PJY/docfx,LordZoltan/docfx,superyyrrzz/docfx,LordZoltan/docfx,928PJY/docfx,hellosnow/docfx,sergey-vershinin/docfx,sergey-vershinin/docfx,dotnet/docfx,hellosnow/docfx,928PJY/docfx,pascalberger/docfx,pascalberger/docfx,superyyrrzz/docfx,dotnet/docfx,pascalberger/docfx,superyyrrzz/docfx,sergey-vershinin/docfx,dotnet/docfx,hellosnow/docfx,LordZoltan/docfx,DuncanmaMSFT/docfx,DuncanmaMSFT/docfx