### 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
raise Invalid(
                'The deprecation removal_date (%s) must be after today (%s)' % (removal_date, today))
    return value
def removal_version(value, is_ansible, current_version=None, is_tombstone=False):
    """Validate a removal version string."""
    msg = (
        'Removal version must be a string' if is_ansible else
        'Removal version must be a semantic version (https://semver.org/)'
    )
    if not isinstance(value, string_types):
        raise Invalid(msg)
    try:
        if is_ansible:
            version = StrictVersion()
            version.parse(value)
            version = LooseVersion(value)  
        else:
            version = SemanticVersion()
            version.parse(value)
            if version.major != 0 and (version.minor != 0 or version.patch != 0):
                raise Invalid('removal_version (%r) must be a major release, not a minor or patch release '
                              '(see specification at https://semver.org/)' % (value, ))
        if current_version is not None:
            if is_tombstone:
                
                if version > current_version:
                    raise Invalid('The tombstone removal_version (%r) must not be after the '
                                  'current version (%s)' % (value, current_version))
            else: