revision.c: trivial fix to message

ancestry-path is an option, not a command - mark it as such.
This brings it in sync with the rest of usages in the file

Signed-off-by: Alexander Shopov <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: alshopov

revision.c

@@ -2320,7 +2320,7 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
 	} else if (skip_prefix(arg, "--ancestry-path=", &optarg)) {
 		struct commit *c;
 		struct object_id oid;
-		const char *msg = _("could not get commit for ancestry-path argument %s");
+		const char *msg = _("could not get commit for --ancestry-path argument %s");
 
 		revs->ancestry_path = 1;
 		revs->simplify_history = 0;