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
```

doc/classes/EditorInspectorPlugin.xml

@@ -21,7 +21,7 @@
 			<argument index="0" name="control" type="Control">
 			</argument>
 			<description>
-				Add a custom control, not necesarily a property editor.
+				Add a custom control, not necessarily a property editor.
 			</description>
 		</method>
 		<method name="add_property_editor">