##### 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 len(env_async_dir) > 0:
                msg = "Setting the async dir from the environment keyword " \
                      "ANSIBLE_ASYNC_DIR is deprecated. Set the async_dir " \
                      "shell option instead"
                self._display.deprecated(msg, "2.12")
            else:
                
                
                
                async_dir = self.get_shell_option('async_dir', default="~/.ansible_async")
                remove_async_dir = len(self._task.environment)
                self._task.environment.append({"ANSIBLE_ASYNC_DIR": async_dir})
        
        (module_style, shebang, module_data, module_path) = self._configure_module(module_name=module_name, module_args=module_args, task_vars=task_vars)
        display.vvv("Using module file %s" % module_path)
        if not shebang and module_style != 'binary':
            raise AnsibleError("module (%s) is missing interpreter line" % module_name)
        self._used_interpreter = shebang
        remote_module_path = None
        if not self._is_pipelining_enabled(module_style, wrap_async):
            
            if tmpdir is None:
                self._make_tmp_path()
                tmpdir = self._connection._shell.tmpdir
            remote_module_filename = self._connection._shell.get_remote_filename(module_path)
            remote_module_path = self._connection._shell.join_path(tmpdir, 'AnsiballZ_%s' % remote_module_filename)
        args_file_path = None
        if module_style in ('old', 'non_native_want_json', 'binary'):
            
            args_file_path = self._connection._shell.join_path(tmpdir, 'args')