### 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
temp_reports = OrderedDict()
        for path, report in reports.items():
            if report['errors'] or report['warnings']:
                temp_reports[path] = report
        return temp_reports
    def plain(self, warnings=False, output='-'):
        """Print out the test results in plain format
        output is ignored here for now
        """
        ret = []
        for path, report in Reporter._filter_out_ok(self.files).items():
            traces = report['traces'][:]
            if warnings and report['warnings']:
                traces.extend(report['warning_traces'])
            for trace in traces:
                print('TRACE:')
                print('\n    '.join(('    %s' % trace).splitlines()))
            for error in report['errors']:
                error['path'] = path
                print('%(path)s:%(line)d:%(column)d: E%(code)s %(msg)s' % error)
                ret.append(1)
            if warnings:
                for warning in report['warnings']:
                    warning['path'] = path
                    print('%(path)s:%(line)d:%(column)d: W%(code)s %(msg)s' % warning)
        return 3 if ret else 0
    def json(self, warnings=False, output='-'):