##### SUMMARY
The warning that `become` show, point to a non-existing page.

The reference: https://docs.ansible.com/ansible/become.html#becoming-an-unprivileged-user
Should be: https://docs.ansible.com/ansible/user_guide/become.html#risks-of-becoming-an-unprivileged-user

```
  msg: |-
    Failed to set permissions on the temporary files Ansible needs to create when becoming an unprivileged user (rc: 1, err: chown: changing ownership of '/var/tmp/ansible-tmp-1587201990.1515293-106086999273646/': Operation not permitted
    chown: changing ownership of '/var/tmp/ansible-tmp-1587201990.1515293-106086999273646/AnsiballZ_postgresql_db.py': Operation not permitted
    }). For information on working around this, see https://docs.ansible.com/ansible/become.html#becoming-an-unprivileged-user
```

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
become

##### ANSIBLE VERSION
```
ansible 2.9.6
  config file = None
  configured module search path = ['/home/robertdb/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.7/site-packages/ansible
  executable location = /usr/local/bin/ansible
  python version = 3.7.6 (default, Jan 30 2020, 09:44:41) [GCC 9.2.1 20190827 (Red Hat 9.2.1-1)]
```

##### CONFIGURATION
```
# empty.
```

##### OS / ENVIRONMENT
Controller: Fedora 31
Managed node: Ubuntu 19

##### STEPS TO REPRODUCE
I use [this](https://github.com/robertdebock/ansible-role-postgres/blob/master/tasks/main.yml#L70) role on Ubuntu 19. (Using [this](https://github.com/robertdebock/ansible-tester) code.

##### EXPECTED RESULTS
The chapter is found immediately.

##### ACTUAL RESULTS
The documentation page loads (good), but does not jump to the right chapter.
'''
        Determines if a tmp path should be created before the action is executed.
        '''
        return getattr(self, 'TRANSFERS_FILES', False)
    def _is_pipelining_enabled(self, module_style, wrap_async=False):
        '''
        Determines if we are required and can do pipelining
        '''
        
        for condition in [
            self._connection.has_pipelining,
            self._play_context.pipelining or self._connection.always_pipeline_modules,  
            module_style == "new",                     
            not C.DEFAULT_KEEP_REMOTE_FILES,           
            not wrap_async or self._connection.always_pipeline_modules,  
            (self._connection.become.name if self._connection.become else '') != 'su',  
            
        ]:
            if not condition:
                return False
        return True
    def _get_admin_users(self):
        '''
        Returns a list of admin users that are configured for the current shell
        plugin
        '''
        return self.get_shell_option('admin_users', ['root'])
    def _get_remote_user(self):