##### 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.
cmd = self._connection._shell.append_command(cmd, 'sleep 0')
            if executable:
                cmd = executable + ' -c ' + shlex_quote(cmd)
        display.debug("_low_level_execute_command(): executing: %s" % (cmd,))
        
        if self._connection.transport == 'local':
            self._connection.cwd = to_bytes(self._loader.get_basedir(), errors='surrogate_or_strict')
        rc, stdout, stderr = self._connection.exec_command(cmd, in_data=in_data, sudoable=sudoable)
        
        
        if isinstance(stdout, binary_type):
            out = to_text(stdout, errors=encoding_errors)
        elif not isinstance(stdout, text_type):
            out = to_text(b''.join(stdout.readlines()), errors=encoding_errors)
        else:
            out = stdout
        if isinstance(stderr, binary_type):
            err = to_text(stderr, errors=encoding_errors)
        elif not isinstance(stderr, text_type):
            err = to_text(b''.join(stderr.readlines()), errors=encoding_errors)
        else:
            err = stderr
        if rc is None:
            rc = 0
        
        out = self._strip_success_message(out)
        display.debug(u"_low_level_execute_command() done: rc=%d, stdout=%s, stderr=%s" % (rc, out, err))
        return dict(rc=rc, stdout=out, stdout_lines=out.splitlines(), stderr=err, stderr_lines=err.splitlines())
    def _get_diff_data(self, destination, source, task_vars, source_file=True):