##### 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.

cmd = [
            self.module.get_bin_path('deluser', True),
            self.name
        ]
        if self.remove:
            cmd.append('--remove-home')
        return self.execute_command(cmd)
    def modify_user(self):
        current_groups = self.user_group_membership()
        groups = []
        rc = None
        out = ''
        err = ''
        info = self.user_info()
        add_cmd_bin = self.module.get_bin_path('adduser', True)
        remove_cmd_bin = self.module.get_bin_path('delgroup', True)
        
        if self.groups is not None and len(self.groups):
            groups = self.get_groups_set()
            group_diff = set(current_groups).symmetric_difference(groups)