##### 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.
playcontext=self._play_context)
            become_kwargs['become_flags'] = self._connection.become.get_option('become_flags',
                                                                               playcontext=self._play_context)
        
        for dummy in (1, 2):
            try:
                (module_data, module_style, module_shebang) = modify_module(module_name, module_path, module_args, self._templar,
                                                                            task_vars=task_vars,
                                                                            module_compression=self._play_context.module_compression,
                                                                            async_timeout=self._task.async_val,
                                                                            environment=final_environment,
                                                                            **become_kwargs)
                break
            except InterpreterDiscoveryRequiredError as idre:
                self._discovered_interpreter = AnsibleUnsafeText(discover_interpreter(
                    action=self,
                    interpreter_name=idre.interpreter_name,
                    discovery_mode=idre.discovery_mode,
                    task_vars=task_vars))
                
                
                discovered_key = 'discovered_interpreter_%s' % idre.interpreter_name
                
                if task_vars.get('ansible_facts') is None:
                    task_vars['ansible_facts'] = {}
                task_vars['ansible_facts'][discovered_key] = self._discovered_interpreter
                
                self._discovered_interpreter_key = discovered_key
        return (module_style, module_shebang, module_data, module_path)
    def _compute_environment_string(self, raw_environment_out=None):