* value.c (show_convenience): Tweak comment.

	* value.c (show_convenience): Tweak comment.
	(_initialize_values): Mention convenience functions in the help text
	for "show convenience".

	doc/
	* gdb.texinfo (Convenience Vars): Update text for "show convenience"
	to include functions.

	testsuite/
	* gdb.base/default.exp: Update expected output of "show convenience".