Fix typos with codespell

Found via `codespell -q 3 --skip="./thirdparty,./editor/translations" -I ../godot-word-whitelist.txt`
Whitelist consists of:
```
ang
doubleclick
lod
nd
que
te
unselect
```

core/message_queue.cpp

@@ -278,7 +278,7 @@ void MessageQueue::flush() {
 
 	while (read_pos < buffer_end) {
 
-		//lock on each interation, so a call can re-add itself to the message queue
+		//lock on each iteration, so a call can re-add itself to the message queue
 
 		Message *message = (Message *)&buffer[read_pos];