This pull request improves the documentation for the following modules:

• pygame.camera
• pygame._sdl2.controller

A note has been added/clarified in the documentation to explicitly mention that these modules must be imported before being used.

The change includes a clearer code example:

import pygame.camera

and

import pygame
import pygame._sdl2.controller

No change was made to pygame.joystick as it does not require an explicit import.

This improvement addresses issue #3922 by making the documentation clearer for new users.