##### 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.

if group_diff:
                if self.append:
                    for g in groups:
                        if g in group_diff:
                            groups_need_mod = True
                            break
                else:
                    groups_need_mod = True
            if groups_need_mod:
                cmd.append('-G')
                new_groups = groups
                if self.append:
                    new_groups.update(current_groups)
                cmd.append(','.join(new_groups))
        if self.comment is not None and info[4] != self.comment:
            cmd.append('-c')
            cmd.append(self.comment)
        if self.home is not None and info[5] != self.home:
            if self.move_home:
                cmd.append('-m')
            cmd.append('-d')
            cmd.append(self.home)
        if self.shell is not None and info[6] != self.shell:
            cmd.append('-s')
            cmd.append(self.shell)
        if self.profile is not None and info[7] != self.profile:
            cmd.append('-P')
            cmd.append(self.profile)
        if self.authorization is not None and info[8] != self.authorization:
            cmd.append('-A')