##### 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 'stdout' in data and 'stdout_lines' not in data:
            
            txt = data.get('stdout', None) or u''
            data['stdout_lines'] = txt.splitlines()
        if 'stderr' in data and 'stderr_lines' not in data:
            
            txt = data.get('stderr', None) or u''
            data['stderr_lines'] = txt.splitlines()
        
        if self._discovered_interpreter_key:
            if data.get('ansible_facts') is None:
                data['ansible_facts'] = {}
            data['ansible_facts'][self._discovered_interpreter_key] = self._discovered_interpreter
        if self._discovery_warnings:
            if data.get('warnings') is None:
                data['warnings'] = []
            data['warnings'].extend(self._discovery_warnings)
        if self._discovery_deprecation_warnings:
            if data.get('deprecations') is None:
                data['deprecations'] = []
            data['deprecations'].extend(self._discovery_deprecation_warnings)
        
        
        data = wrap_var(data)
        display.debug("done with _execute_module (%s, %s)" % (module_name, module_args))
        return data
    def _parse_returned_data(self, res):
        try:
            filtered_output, warnings = _filter_non_json_lines(res.get('stdout', u''))
            for w in warnings: