Fix example in quote

The example prints "Got 25", not just "25"

Author: Lorenzo Manacorda

lib/elixir/lib/kernel/special_forms.ex

@@ -820,7 +820,7 @@ defmodule Kernel.SpecialForms do
 
       Returning 5
       Returning 5
-      25
+      Got 25
 
   Notice how "Returning 5" was printed twice, instead of just once. This is
   because a macro receives an expression and not a value (which is what we