Merge branch 'th/maint-remote-update-help-string' into maint

* th/maint-remote-update-help-string:
  Update 'git remote update' usage string to match man page.

builtin-remote.c

@@ -15,7 +15,7 @@ static const char * const builtin_remote_usage[] = {
 	"git remote set-head <name> (-a | -d | <branch>)",
 	"git remote [-v | --verbose] show [-n] <name>",
 	"git remote prune [-n | --dry-run] <name>",
-	"git remote [-v | --verbose] update [-p | --prune] [group]",
+	"git remote [-v | --verbose] update [-p | --prune] [group | remote]",
 	NULL
 };