##### 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 self.module.params['password'] and self.platform != 'Darwin':
            maybe_invalid = False
            
            if self.module.params['password'] in set(['*', '!', '*************']):
                maybe_invalid = False
            else:
                
                
                if any(char in self.module.params['password'] for char in ':*!'):
                    maybe_invalid = True
                if '$' not in self.module.params['password']:
                    maybe_invalid = True
                else:
                    fields = self.module.params['password'].split("$")