### 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
module = module_names_by_path.get(path)
            if module:
                untested_modules.append(module)
        comments = [
            self.format_comment(self.TEMPLATE_DISABLED, disabled_targets),
            self.format_comment(self.TEMPLATE_UNSTABLE, unstable_targets),
            self.format_comment(self.TEMPLATE_UNSUPPORTED, unsupported_targets),
            self.format_comment(self.TEMPLATE_UNTESTED, untested_modules),
        ]
        comments = [comment for comment in comments if comment]
        labels = dict(
            needs_tests=bool(untested_modules),
            disabled_tests=bool(disabled_targets),
            unstable_tests=bool(unstable_targets),
            unsupported_tests=bool(unsupported_targets),
        )
        results['comments'] += comments
        results['labels'].update(labels)
    def format_comment(self, template, targets):  
        """Format and return a comment based on the given template and targets, or None if there are no targets."""
        if not targets:
            return None
        tests = '\n'.join('- %s' % target for target in targets)
        data = dict(
            explain_url=self.EXPLAIN_URL,
            tests=tests,
        )
        message = textwrap.dedent(template).strip().format(**data)
        return message