### 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_by"
                if context:
                    msg += " found in %s" % " -> ".join(context)
                msg += " contains terms which are not part of argument_spec: %s" % ", ".join(sorted(set(value).difference(set(spec))))
                self.reporter.error(
                    path=self.object_path,
                    code='required_by-unknown',
                    msg=msg,
                )
    def _validate_argument_spec(self, docs, spec, kwargs, context=None, last_context_spec=None):
        if not self.analyze_arg_spec:
            return
        if docs is None:
            docs = {}
        if context is None:
            context = []
        if last_context_spec is None:
            last_context_spec = kwargs
        try:
            if not context:
                add_fragments(docs, self.object_path, fragment_loader=fragment_loader, is_module=True)
        except Exception:
            
            return
        
        module = NoArgsAnsibleModule({})
        self._validate_list_of_module_args('mutually_exclusive', last_context_spec.get('mutually_exclusive'), spec, context)
        self._validate_list_of_module_args('required_together', last_context_spec.get('required_together'), spec, context)
        self._validate_list_of_module_args('required_one_of', last_context_spec.get('required_one_of'), spec, context)
        self._validate_required_if(last_context_spec.get('required_if'), spec, context, module)