receive-pack: update comment with check_everything_connected

That function is now called "check_connected()", but we forgot to update
this comment in 7043c7071c (check_everything_connected: use a struct
with named options, 2016-07-15).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/receive-pack.c

@@ -1628,7 +1628,7 @@ static void prepare_shallow_update(struct command *commands,
 	/*
 	 * keep hooks happy by forcing a temporary shallow file via
 	 * env variable because we can't add --shallow-file to every
-	 * command. check_everything_connected() will be done with
+	 * command. check_connected() will be done with
 	 * true .git/shallow though.
 	 */
 	setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1);