Update git fsck --full short description to mention packs

The '--full' option to git fsck does two things:

  1) Check objects in packs
  2) Check alternate objects

This is documented in the git fsck manual; this patch reflects that in
the short git fsck option help message as well.
Signed-off-by: NWesley J. Landaker <wjl@icecavern.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin-fsck.c

@@ -578,7 +578,7 @@ static struct option fsck_opts[] = {
 	OPT_BOOLEAN(0, "root", &show_root, "report root nodes"),
 	OPT_BOOLEAN(0, "cache", &keep_cache_objects, "make index objects head nodes"),
 	OPT_BOOLEAN(0, "reflogs", &include_reflogs, "make reflogs head nodes (default)"),
-	OPT_BOOLEAN(0, "full", &check_full, "also consider alternate objects"),
+	OPT_BOOLEAN(0, "full", &check_full, "also consider packs and alternate objects"),
 	OPT_BOOLEAN(0, "strict", &check_strict, "enable more strict checking"),
 	OPT_BOOLEAN(0, "lost-found", &write_lost_and_found,
 				"write dangling objects in .git/lost-found"),