##### 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.
if res['rc'] != 0:
                        raise AnsibleError('Failed to set file mode on remote temporary files (rc: {0}, err: {1})'.format(res['rc'], to_native(res['stderr'])))
                res = self._remote_chown(remote_paths, self.get_become_option('become_user'))
                if res['rc'] != 0 and remote_user in self._get_admin_users():
                    
                    raise AnsibleError('Failed to change ownership of the temporary files Ansible needs to create despite connecting as a privileged user. '
                                       'Unprivileged become user would be unable to read the file.')
                elif res['rc'] != 0:
                    if C.ALLOW_WORLD_READABLE_TMPFILES:
                        
                        
                        display.warning('Using world-readable permissions for temporary files Ansible needs to create when becoming an unprivileged user. '
                                        'This may be insecure. For information on securing this, see '
                                        'https://docs.ansible.com/ansible/become.html#becoming-an-unprivileged-user')
                        res = self._remote_chmod(remote_paths, 'a+%s' % chmod_mode)
                        if res['rc'] != 0:
                            raise AnsibleError('Failed to set file mode on remote files (rc: {0}, err: {1})'.format(res['rc'], to_native(res['stderr'])))
                    else:
                        raise AnsibleError('Failed to set permissions on the temporary files Ansible needs to create when becoming an unprivileged user '
                                           '(rc: %s, err: %s}). For information on working around this, see '
                                           'https://docs.ansible.com/ansible/become.html#becoming-an-unprivileged-user'
                                           % (res['rc'], to_native(res['stderr'])))
        elif execute:
            
            
            res = self._remote_chmod(remote_paths, 'u+x')
            if res['rc'] != 0:
                raise AnsibleError('Failed to set execute bit on remote files (rc: {0}, err: {1})'.format(res['rc'], to_native(res['stderr'])))
        return remote_paths
    def _remote_chmod(self, paths, mode, sudoable=False):