completion: add more parameter value completion

This adds value completion for a couple more paramters. To make it
easier to maintain these hard coded lists, add a comment at the original
list/code to remind people to update git-completion.bash too.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/replace.c

@@ -82,6 +82,10 @@ static int list_replace_refs(const char *pattern, const char *format)
 		data.format = REPLACE_FORMAT_MEDIUM;
 	else if (!strcmp(format, "long"))
 		data.format = REPLACE_FORMAT_LONG;
+	/*
+	 * Please update _git_replace() in git-completion.bash when
+	 * you add new format
+	 */
 	else
 		return error(_("invalid replace format '%s'\n"
 			       "valid formats are 'short', 'medium' and 'long'"),