Fix documentation for C# on the Mac
Fix documentation for C# on the Mac

rchavarria/docs,canweriotnow/docs,NobbZ/docs,canweriotnow/docs,alexclarkofficial/docs,exercism/DEPRECATED.help.exercism.io,k4rtik/docs,k4rtik/docs,lfex/exercism-docs,NobbZ/docs,arashbi/docs,yurrriq/docs,ekse/exercism-docs,yurrriq/docs,exercism/DEPRECATED.help.exercism.io,ZacharyRSmith/docs,spazm/docs,ekse/exercism-docs,alexclarkofficial/docs,lfex/exercism-docs,spazm/docs,arashbi/docs,ZacharyRSmith/docs,rchavarria/docs