### Summary

when running ansible-test over a collection, if there are errors or failures, it will link you to the correct documentation to help resolve the issue. this functionality is currently broken as it is linking to `docs.ansible.com/ansible/` instead of `docs.ansible.com/ansible-core/` which leads to 404s. 


### Issue Type

Bug Report

### Component Name

ansible-test

### Ansible Version

```console
$ ansible --version
ansible [core 2.11.2]
```


### Configuration

```console
$ ansible-config dump --only-changed
```


### OS / Environment

Fedora 34

### Steps to Reproduce

<!--- Paste example playbooks or commands between quotes below -->
```yaml (paste below)
ansible-test sanity --docker
```


### Expected Results

Expect for docs link to correct navigate to the correct documentation. 

### Actual Results

```console
leads to documentation that 404s. Ex: https://docs.ansible.com/ansible/2.12/dev_guide/testing/sanity/pylint.html
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
"""Return a string containing a title/heading for this test failure, including an optional help link to explain the test."""
        command = self.format_command()
        if self.summary:
            reason = 'the error'
        else:
            reason = '1 error' if len(self.messages) == 1 else '%d errors' % len(self.messages)
        if help_link:
            help_link_markup = ' [[explain](%s)]' % help_link
        else:
            help_link_markup = ''
        title = 'The test `%s`%s failed with %s:' % (command, help_link_markup, reason)
        return title
    def format_block(self):  
        """Format the test summary or messages as a block of text and return the result."""
        if self.summary:
            block = self.summary
        else:
            block = '\n'.join(m.format() for m in self.messages)
        message = block.strip()
        
        message = message.replace(display.clear, '')
        return message
class TestMessage: