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
```

editor/dictionary_property_edit.cpp

@@ -41,7 +41,7 @@ void DictionaryPropertyEdit::_notif_changev(const String &p_v) {
 
 void DictionaryPropertyEdit::_set_key(const Variant &p_old_key, const Variant &p_new_key) {
 
-	// TODO: Set key of a dictionary is not allowd yet
+	// TODO: Set key of a dictionary is not allowed yet
 	return;
 }