Fix missing forward slashes in Unix Snippet4 System.IO.Path.Combine(String, String, String, String) (#11516)

Author: casuffitsharp

snippets/csharp/System.IO/Path/Combine/Program.cs

@@ -76,7 +76,7 @@ private static void Combine4()
         //    C:\Pictures\Saved Pictures\2019\Jan\
         //
         // The example displays the following output if run on a Unix-based system:
-        //    C:\Pictures\Saved Pictures\2019\Jan\      
+        //    C:\Pictures\/Saved Pictures\/2019\/Jan\
         // </Snippet4>
     }
 }

snippets/visualbasic/api/system.io/path/combine/Program.vb

@@ -72,7 +72,7 @@ Module Program
         '    C:\Pictures\Saved Pictures\2019\Jan\
         '
         ' The example displays the following output if run on a Unix-based system:
-        '    C:\Pictures\Saved Pictures\2019\Jan\      
+        '    C:\Pictures\/Saved Pictures\/2019\/Jan\
         ' </Snippet4>
     End Sub
 End Module