##### 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.
elif u'No space left on device' in result['stderr']:
                output = result['stderr']
            else:
                output = ('Failed to create temporary directory.'
                          'In some cases, you may have been able to authenticate and did not have permissions on the target directory. '
                          'Consider changing the remote tmp path in ansible.cfg to a path rooted in "/tmp", for more error information use -vvv. '
                          'Failed command was: %s, exited with result %d' % (cmd, result['rc']))
            if 'stdout' in result and result['stdout'] != u'':
                output = output + u", stdout output: %s" % result['stdout']
            if self._play_context.verbosity > 3 and 'stderr' in result and result['stderr'] != u'':
                output += u", stderr output: %s" % result['stderr']
            raise AnsibleConnectionFailure(output)
        else:
            self._cleanup_remote_tmp = True
        try:
            stdout_parts = result['stdout'].strip().split('%s=' % basefile, 1)
            rc = self._connection._shell.join_path(stdout_parts[-1], u'').splitlines()[-1]
        except IndexError:
            
            rc = '/'
        
        
        if rc == '/':
            raise AnsibleError('failed to resolve remote temporary directory from %s: `%s` returned empty string' % (basefile, cmd))
        self._connection._shell.tmpdir = rc
        return rc
    def _should_remove_tmp_path(self, tmp_path):
        '''Determine if temporary path should be deleted or kept by user request/config'''
        return tmp_path and self._cleanup_remote_tmp and not C.DEFAULT_KEEP_REMOTE_FILES and "-tmp-" in tmp_path
    def _remove_tmp_path(self, tmp_path):