### 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
"""Populate test result confidence using the provided metadata."""
        for message in self.messages:
            if message.confidence is None:
                message.confidence = calculate_confidence(message.path, message.line, metadata)
    def format_command(self):  
        """Return a string representing the CLI command associated with the test failure."""
        command = 'ansible-test %s' % self.command
        if self.test:
            command += ' --test %s' % self.test
        if self.python_version:
            command += ' --python %s' % self.python_version
        return command
    def find_docs(self):
        """
        :rtype: str
        """
        if self.command != 'sanity':
            return None  
        
        
        ansible_version = get_ansible_version()
        url_version = 'devel'
        if re.search(r'^[0-9.]+$', ansible_version):
            url_version = '.'.join(ansible_version.split('.')[:2])
        testing_docs_url = 'https://docs.ansible.com/ansible/%s/dev_guide/testing' % url_version
        url = '%s/%s/' % (testing_docs_url, self.command)
        if self.test:
            url += '%s.html' % self.test
        return url
    def format_title(self, help_link=None):