text: Title: Documentation wrong on page for "badges"
  Body: ## Description of the problem, including code/CLI snippet
  
  Documentation seems to be wrong here:
  https://python-gitlab.readthedocs.io/en/stable/gl_objects/badges.html#examples
  -> "Update a badge"
  
  ## Expected Behavior
  Update a badge:
  badge.image_url = new_image_url
  badge.link_url = new_link_url
  badge.save()
  
  ## Actual Behavior
  Update a badge:
  badge.image_link = new_link
  badge.save()
  
  ## Specifications
  
    - python-gitlab version: documentation issue only
    - API version you are using: documentation issue only
    - Gitlab server version: documentation issue only
  