ipauser: Fix documentation sections and agument spec

ansible-test with ansible-2.14 is adding a lot of new tests to ensure
that the documentation section and the agument spec is complete. Needed
changes:

DOCUMENTATION section

- `type: str` needs to be set for string parameters
- `type: list` needs to be set for list parameters
- `elements: str` needs to be given for list of string parameters
- `elements: dict` needs to be given for list of dict parameters
- `aliases` tag needs to match `argument_spec`
- `author` needs to be given with the github user also: `Name (@user)`

RETURN section

- `contains` needs to be used instead of `options` for dicts
- `type: str` needs to be used for string parameters

argument_spec

- `elements="str"` needs to be added to all list of string parameters
- `no_log=False` or `no_log=True` needs to be set for all parameters
  that have `password` in the name

The `copyright` date is extended with `-2022`.

Note:
The alias "login" was used for "users" instead of "users"->"name".
"login" is an alias for "name" if "users" is not used.