##### 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.

default: default set by ssh-keygen
        version_added: "0.9"
    ssh_key_type:
        description:
            - Optionally specify the type of SSH key to generate.
            - Available SSH key types will depend on implementation
              present on target host.
        type: str
        default: rsa
        version_added: "0.9"
    ssh_key_file:
        description:
            - Optionally specify the SSH key filename.
            - If this is a relative filename then it will be relative to the user's home directory.
            - This parameter defaults to I(.ssh/id_rsa).
        type: path
        version_added: "0.9"
    ssh_key_comment:
        description:
            - Optionally define the comment for the SSH key.
        type: str
        default: ansible-generated on $HOSTNAME
        version_added: "0.9"
    ssh_key_passphrase:
        description:
            - Set a passphrase for the SSH key.
            - If no passphrase is provided, the SSH key will default to having no passphrase.
        type: str
        version_added: "0.9"
    update_password: