Merge pull request #5884 from dotnet/master

Update live with current master

Author: mairaw

docs/csharp/language-reference/keywords/codesnippet/CSharp/sealed_1.cs

@@ -11,7 +11,7 @@ class Y : X
     class Z : Y
     {
         // Attempting to override F causes compiler error CS0239.
-        // protected override void F() { Console.WriteLine("C.F"); }
+        // protected override void F() { Console.WriteLine("Z.F"); }
 
         // Overriding F2 is allowed.
         protected override void F2() { Console.WriteLine("Z.F2"); }