netinet: Fix a common typo in source code comments

- s/segement/segment/

(cherry picked from commit 1dadeab)

sys/netinet/tcp_lro.c

@@ -992,7 +992,7 @@ tcp_lro_condense(struct lro_ctrl *lc, struct lro_entry *le)
 	}
 	if ((th->th_flags & ~(TH_ACK | TH_PUSH)) != 0) {
 		/*
-		 * Make sure that previously seen segements/ACKs are delivered
+		 * Make sure that previously seen segments/ACKs are delivered
 		 * before this segment, e.g. FIN.
 		 */
 		le->m_head->m_nextpkt = m->m_nextpkt;

sys/netinet/tcp_stacks/bbr.c

@@ -309,7 +309,7 @@ int32_t bbr_sends_full_iwnd = 1;
  *
  * To implement BBR and RACK the original TCP stack was first decomposed
  * into a functional state machine with individual states
- * for each of the possible TCP connection states. The do_segement
+ * for each of the possible TCP connection states. The do_segment
  * functions role in life is to mandate the connection supports SACK
  * initially and then assure that the RACK state matches the conenction
  * state before calling the states do_segment function. Data processing

sys/netinet/tcp_stacks/rack.c

@@ -173,7 +173,7 @@ struct sysctl_oid *rack_sysctl_root;
  *
  * To implement RACK the original TCP stack was first decomposed
  * into a functional state machine with individual states
- * for each of the possible TCP connection states. The do_segement
+ * for each of the possible TCP connection states. The do_segment
  * functions role in life is to mandate the connection supports SACK
  * initially and then assure that the RACK state matches the conenction
  * state before calling the states do_segment function. Each