Start conforming code to "git subcmd" style part 3

User notifications are presented as 'git cmd', and code comments
are presented as '"cmd"' or 'git's cmd', rather than 'git-cmd'.

Signed-off-by: Heikki Orsila <heikki.orsila@iki.fi>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-rev-list.c

@@ -178,7 +178,7 @@ static void finish_object(struct object_array_entry *p)
 static void show_object(struct object_array_entry *p)
 {
 	/* An object with name "foo\n0000000..." can be used to
-	 * confuse downstream git-pack-objects very badly.
+	 * confuse downstream "git pack-objects" very badly.
 	 */
 	const char *ep = strchr(p->name, '\n');