Fix typos found in iperf

We have noticed that `sockt` is often used as a variable name,
probably because `socket` is a POSIX function. Therefore add it
to the code dioctionary.

codespell_lib/data/dictionary_code.txt

@@ -64,6 +64,8 @@ shouldnot->should not, shouldn't,
 sinc->sync, sink, since,
 sincs->syncs, sinks, since,
 snd->send, and, sound,
+sockt->socket
+sockts->sockets
 spawnve->spawn
 stdio->studio
 stdios->studios