### 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
except AssertionError:
                            fragment = doc['extends_documentation_fragment']
                            self.reporter.error(
                                path=self.object_path,
                                code='missing-doc-fragment',
                                msg='DOCUMENTATION fragment missing: %s' % fragment
                            )
                            missing_fragment = True
                        except Exception as e:
                            self.reporter.trace(
                                path=self.object_path,
                                tracebk=traceback.format_exc()
                            )
                            self.reporter.error(
                                path=self.object_path,
                                code='documentation-error',
                                msg='Unknown DOCUMENTATION error, see TRACE: %s' % e
                            )
                    if not missing_fragment:
                        add_fragments(doc, self.object_path, fragment_loader=fragment_loader, is_module=True)
                    if 'options' in doc and doc['options'] is None:
                        self.reporter.error(
                            path=self.object_path,
                            code='invalid-documentation-options',
                            msg='DOCUMENTATION.options must be a dictionary/hash when used',
                        )
                    if 'deprecated' in doc and doc.get('deprecated'):
                        doc_deprecated = True
                        doc_deprecation = doc['deprecated']
                        documentation_collection = doc_deprecation.get('removed_from_collection')