##### SUMMARY
The documentation of the module *user* / parameter *shell* states:

https://github.com/ansible/ansible/blob/8edad83ae029d7838a6d6347576d2ddbcce12ad0/lib/ansible/modules/system/user.py#L79

But there are no (shell specific) notes.
##### ISSUE TYPE
- Documentation Report

##### COMPONENT NAME
user / docs

##### ANSIBLE VERSION
devel branch

##### CONFIGURATION
N/A

##### OS / ENVIRONMENT
N/A

##### ADDITIONAL INFORMATION
Either remove the sentence or provide some information in the notes section.

"""
    This is a generic User manipulation class that is subclassed
    based on platform.
    A subclass may wish to override the following action methods:-
      - create_user()
      - remove_user()
      - modify_user()
      - ssh_key_gen()
      - ssh_key_fingerprint()
      - user_exists()
    All subclasses MUST define platform and distribution (which may be None).
    """
    platform = 'Generic'
    distribution = None
    PASSWORDFILE = '/etc/passwd'
    SHADOWFILE = '/etc/shadow'
    SHADOWFILE_EXPIRE_INDEX = 7
    LOGIN_DEFS = '/etc/login.defs'
    DATE_FORMAT = '%Y-%m-%d'
    def __new__(cls, *args, **kwargs):