(Antinews): Mention `G' interactive code.

lispref/anti.texi

@@ -237,6 +237,10 @@ longer accept lists of strings or hash tables (it will still accept
 alists, obarrays, and functions.)  In addition, the function
 @code{test-completion} is no longer available.
 
+@item
+The @samp{G} interactive code character is no longer supported.
+Use @samp{F} instead.
+
 @item
 Arbitrary Lisp functions can no longer be recorded into
 @code{buffer-undo-list}.  As a consequence, @code{yank-undo-function}