refspec: fix typo in comment

Fix a long-standing typo in a comment: "refpsecs" -> "refspecs".

Signed-off-by: K Jayatheerth <jayatheerthkulkarni2005@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: jayatheerthkulkarni

refspec.c

@@ -85,7 +85,7 @@ static int parse_refspec(struct refspec_item *item, const char *refspec, int fet
 		if (!*item->src)
 			return 0; /* negative refspecs must not be empty */
 		else if (llen == the_hash_algo->hexsz && !get_oid_hex(item->src, &unused))
-			return 0; /* negative refpsecs cannot be exact sha1 */
+			return 0; /* negative refspecs cannot be exact sha1 */
 		else if (!check_refname_format(item->src, flags))
 			; /* valid looking ref is ok */
 		else