fix invalid code snippet in "Adding optional parameters to public methods (#48725)
fix invalid code snippet in "Adding optional parameters to public methods (#48725)


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