### Summary

The documentation about how systems determine the default shell is confusing.

At the [shell parameter](https://docs.ansible.com/ansible/latest/collections/ansible/builtin/user_module.html#parameter-shell) is written: "See notes for details on how other operating systems determine the default shell by the underlying tool."

The [Notes section](https://docs.ansible.com/ansible/latest/collections/ansible/builtin/user_module.html#notes) does not contain "details on how other operating systems determine the default shell".

If I read this, I would expect to find something along the lines of "On FreeBSD, the default shell is set by `dscl`". 

Instead, it contains notes on which underlying tools are used by the module to create, modify and remove accounts. This is only helpful if the reader is already aware of the fact that these underlying tools _also_ set the default shell.

Furthermore, since the notes at the shell parameter explicitly spell out what the default shell on macOS is, the user has a reasonable expectation to find similarly worded notes for other operating systems in the Notes.

A possible solution: replace "See notes for details on how other operating systems determine the default shell by the underlying tool." with "On other operating systems, the default shell is determined by the underlying tool invoked by this module. See Notes for a per platform list of invoked tools."

### Issue Type

Documentation Report

### Component Name

lib/ansible/modules/user.py

### Ansible Version

```console
N/a
```


### Configuration

```console
N/a
```


### OS / Environment

N/a

### Additional Information

Previous bug report and attempted (but IMO inadequate) fix here: https://github.com/ansible/ansible/issues/59796. 

### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
- Optionally set the user's home directory.
        type: path
    skeleton:
        description:
            - Optionally set a home skeleton directory.
            - Requires O(create_home) option!
        type: str
        version_added: "2.0"
    password:
        description:
            - If provided, set the user's password to the provided encrypted hash (Linux) or plain text password (macOS).
            - B(Linux/Unix/POSIX:) Enter the hashed password as the value.
            - See L(FAQ entry,https://docs.ansible.com/ansible/latest/reference_appendices/faq.html#how-do-i-generate-encrypted-passwords-for-the-user-module)
              for details on various ways to generate the hash of a password.
            - To create an account with a locked/disabled password on Linux systems, set this to V('!') or V('*').
            - To create an account with a locked/disabled password on OpenBSD, set this to V('*************').
            - B(OS X/macOS:) Enter the cleartext password as the value. Be sure to take relevant security precautions.
            - On macOS, the password specified in the C(password) option will always be set, regardless of whether the user account already exists or not.
            - When the password is passed as an argument, the C(user) module will always return changed to C(true) for macOS systems.
              Since macOS no longer provides access to the hashed passwords directly.
        type: str
    state:
        description:
            - Whether the account should exist or not, taking action if the state is different from what is stated.
            - See this L(FAQ entry,https://docs.ansible.com/ansible/latest/reference_appendices/faq.html#running-on-macos-as-a-target)
              for additional requirements when removing users on macOS systems.
        type: str
        choices: [ absent, present ]
        default: present
    create_home: