documentation of locateOnScreen(): tell people that the template cannot be a different scale

[crackwitz]

This keeps getting asked on Stack Overflow.

Beginners keep thinking they can just take whatever template they want, at whatever scale they want. Some even intentionally scale/resize stuff around, thinking "that can't hurt, right?"

Please explain this in the docs. These people keep showing up with the same questions.

Here is just the latest question I'm aware of: https://stackoverflow.com/questions/79568828/image-matching-fails-with-low-confidence-using-pyautogui-when-script-is-triggere