replace: add --edit to usage string

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/replace.c

@@ -16,6 +16,7 @@
 
 static const char * const git_replace_usage[] = {
 	N_("git replace [-f] <object> <replacement>"),
+	N_("git replace [-f] --edit <object>"),
 	N_("git replace -d <object>..."),
 	N_("git replace [--format=<format>] [-l [<pattern>]]"),
 	NULL