Fix typos with codespell

Using codespell 1.15.0.

Method:
```
$ cat > ../godot-word-whitelist.txt << EOF
ang
curvelinear
doubleclick
leapyear
lod
merchantibility
nd
numer
ois
ony
que
seeked
synching
te
uint
unselect
webp
EOF

$ codespell -w -q 3 -I ../godot-word-whitelist.txt --skip="./thirdparty,*.po"
$ git diff // undo unwanted changes
```

modules/gdscript/gdscript.cpp

@@ -1064,7 +1064,7 @@ Variant::Type GDScriptInstance::get_property_type(const StringName &p_name, bool
 }
 
 void GDScriptInstance::get_property_list(List<PropertyInfo> *p_properties) const {
-	// exported members, not doen yet!
+	// exported members, not done yet!
 
 	const GDScript *sptr = script.ptr();
 	List<PropertyInfo> props;