Function update_text

update_text(textGameObject: TextGameObject, text: string): GameObject
Updates the text of the TextGameObject.
Parameters
- textGameObject: TextGameObject
  TextGameObject reference
- text: string
  The updated text of the TextGameObject
Returns GameObject
the GameObject reference passed in
Throws
Error if not a TextGameObject is passed in
Example
```
update_text(create_text('Hello world!'), 'Goodbye world!');
```