### 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
"""Validate a datetime.date or ISO 8601 date string."""
    
    if isinstance(value, datetime.date):
        removal_date = value
    else:
        
        msg = 'Expected ISO 8601 date string (YYYY-MM-DD), or YAML date'
        if not isinstance(value, string_types):
            raise Invalid(msg)
        
        
        if not re.match('^[0-9]{4}-[0-9]{2}-[0-9]{2}$', value):
            raise Invalid(msg)
        try:
            removal_date = datetime.datetime.strptime(value, '%Y-%m-%d').date()
        except ValueError:
            raise Invalid(msg)
    
    today = datetime.date.today()
    if is_tombstone:
        
        if today < removal_date:
            raise Invalid(
                'The tombstone removal_date (%s) must not be after today (%s)' % (removal_date, today))
    else:
        
        
        if check_deprecation_date and today > removal_date: