### 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
msg = "required_if"
                if context:
                    msg += " found in %s" % " -> ".join(context)
                msg += " contains its key %s in requirements" % key
                self.reporter.error(
                    path=self.object_path,
                    code='required_if-key-in-requirements',
                    msg=msg,
                )
            value = check[1]
            if value is not None:
                _type = spec[key].get('type', 'str')
                if callable(_type):
                    _type_checker = _type
                else:
                    _type_checker = DEFAULT_TYPE_VALIDATORS.get(_type)
                try:
                    with CaptureStd():
                        dummy = _type_checker(value)
                except (Exception, SystemExit):
                    msg = "required_if"
                    if context:
                        msg += " found in %s" % " -> ".join(context)
                    msg += " has value %r which does not fit to %s's parameter type %r" % (value, key, _type)
                    self.reporter.error(
                        path=self.object_path,
                        code='required_if-value-type',
                        msg=msg,
                    )
    def _validate_required_by(self, terms, spec, context):