Fix titles markdown in MetadataFormat.md
Fix titles markdown in MetadataFormat.md

gafter/roslyn,jmarolf/roslyn,mgoertz-msft/roslyn,weltkante/roslyn,diryboy/roslyn,brettfo/roslyn,mgoertz-msft/roslyn,eriawan/roslyn,panopticoncentral/roslyn,weltkante/roslyn,shyamnamboodiripad/roslyn,mgoertz-msft/roslyn,weltkante/roslyn,KirillOsenkov/roslyn,aelij/roslyn,wvdd007/roslyn,tmat/roslyn,dotnet/roslyn,jasonmalinowski/roslyn,ErikSchierboom/roslyn,sharwell/roslyn,ErikSchierboom/roslyn,tannergooding/roslyn,genlu/roslyn,jmarolf/roslyn,AmadeusW/roslyn,KevinRansom/roslyn,stephentoub/roslyn,jasonmalinowski/roslyn,KirillOsenkov/roslyn,heejaechang/roslyn,panopticoncentral/roslyn,tannergooding/roslyn,AlekseyTs/roslyn,AmadeusW/roslyn,CyrusNajmabadi/roslyn,stephentoub/roslyn,tmat/roslyn,sharwell/roslyn,heejaechang/roslyn,eriawan/roslyn,wvdd007/roslyn,diryboy/roslyn,AlekseyTs/roslyn,CyrusNajmabadi/roslyn,genlu/roslyn,KevinRansom/roslyn,CyrusNajmabadi/roslyn,mavasani/roslyn,dotnet/roslyn,eriawan/roslyn,bartdesmet/roslyn,davkean/roslyn,AlekseyTs/roslyn,gafter/roslyn,physhi/roslyn,bartdesmet/roslyn,brettfo/roslyn,diryboy/roslyn,shyamnamboodiripad/roslyn,sharwell/roslyn,tmat/roslyn,physhi/roslyn,panopticoncentral/roslyn,stephentoub/roslyn,wvdd007/roslyn,KevinRansom/roslyn,aelij/roslyn,aelij/roslyn,dotnet/roslyn,mavasani/roslyn,KirillOsenkov/roslyn,gafter/roslyn,davkean/roslyn,tannergooding/roslyn,jmarolf/roslyn,heejaechang/roslyn,brettfo/roslyn,shyamnamboodiripad/roslyn,jasonmalinowski/roslyn,bartdesmet/roslyn,physhi/roslyn,genlu/roslyn,AmadeusW/roslyn,mavasani/roslyn,ErikSchierboom/roslyn,davkean/roslyn