##### 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.append(','.join(groups))
        if self.comment is not None:
            cmd.append('-c')
            cmd.append(self.comment)
        if self.home is not None:
            cmd.append('-d')
            cmd.append(self.home)
        if self.shell is not None:
            cmd.append('-s')
            cmd.append(self.shell)
        if self.password is not None:
            cmd.append('-p')
            cmd.append(self.password)
        if self.create_home:
            cmd.append('-m')
        else:
            cmd.append('-M')
        if self.system:
            cmd.append('-r')
        cmd.append(self.name)
        return self.execute_command(cmd)
    def remove_user(self):
        cmd = ['/usr/sam/lbin/userdel.sam']
        if self.force:
            cmd.append('-F')
        if self.remove:
            cmd.append('-r')
        cmd.append(self.name)
        return self.execute_command(cmd)
    def modify_user(self):