text: Title: [Syntax] Examples Clarification
  Body: ## Description of the problem, including code/CLI snippet
  
  For some provided examples, initialization of a GitLab object instance appears to use lowercase characters.  No where in the package is a difference in capitalization noted.
  
  Example: [https://python-gitlab.readthedocs.io/en/stable/api-usage-advanced.html#rate-limits](Advanced Usage: Rate Limits) -  
  
  ```python
  import gitlab
  import requests
  
  # This object should be capitalized?
  #             |
  #             |
  #             |
  #             V
  gl = gitlab.gitlab(url, token, api_version=4)
  gl.projects.list(get_all=True, obey_rate_limit=False)
  ```
  
  Given that Python is a case-sensitive language, `gitlab.Gitlab` != `gitlab.gitlab` unless it's explicitly aliased or noted that either will work.
  
  ## Expected Behavior
  
  `N/A`
  
  ## Actual Behavior
  
  `N/A`
  
  ## Specifications
  
    - python-gitlab version: `All`
    - API version you are using (v3/v4): `v4`
    - Gitlab server version (or gitlab.com): `gitlab.com`
  