Remove now unnecessary comment.

sys/netinet/tcp_output.c

@@ -1391,8 +1391,6 @@ tcp_addoptions(struct tcpopt *to, u_char *optp)
 	 *   "The content of the header beyond the End-of-Option option
 	 *    must be header padding (i.e., zero)."
 	 *   and later: "The padding is composed of zeros."
-	 * While EOLs are zeros use an explicit 0x00 here to not confuse
-	 * people with padding of EOLs.
 	 */
 	while (optlen % 4) {
 		optlen += TCPOLEN_PAD;