### Summary

The help from ``ansible-galaxy collection verify`` reads:
```
positional arguments:
  collection_name       The collection(s) name or path/url to a tar.gz collection artifact. This is mutually exclusive with --requirements-file.
```

However, only ``namespace.collection`` appears supported.

### Issue Type

Bug Report

### Component Name

ansible-galaxy

### Ansible Version

```console
ansible [core 2.11.6] 
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/dmsimard/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/dmsimard/dev/virtualenvs/ansible/lib64/python3.9/site-packages/ansible
  ansible collection location = /home/dmsimard/.ansible/collections:/usr/share/ansible/collections
  executable location = /home/dmsimard/dev/virtualenvs/ansible/bin/ansible
  python version = 3.9.7 (default, Aug 30 2021, 00:00:00) [GCC 11.2.1 20210728 (Red Hat 11.2.1-1)]
  jinja version = 3.0.2
  libyaml = True
```


### Configuration

```console
not relevant
```


### OS / Environment

not relevant

### Steps to Reproduce

From ``ansible-galaxy collection verify --help``:
```
> ansible-galaxy collection verify --help
usage: ansible-galaxy collection verify [-h] [-s API_SERVER] [--token API_KEY] [-c] [-v] [-p COLLECTIONS_PATH] [-i] [--offline] [-r REQUIREMENTS] [collection_name ...]

positional arguments:
  collection_name       The collection(s) name or path/url to a tar.gz collection artifact. This is mutually exclusive with --requirements-file.
```
^ **The collection(s) name or path/url to a tar.gz collection artifact.**


However:
```
> wget https://galaxy.ansible.com/download/community-general-3.8.0.tar.gz
2021-10-19 12:37:28 (8.82 MB/s) - ‘community-general-3.8.0.tar.gz’ saved [2220728/2220728]

> ansible-galaxy collection verify community-general-3.8.0.tar.gz
ERROR! 'file' type is not supported. The format namespace.name is expected.

> ansible-galaxy collection verify https://galaxy.ansible.com/download/community-general-3.8.0.tar.gz
Downloading https://galaxy.ansible.com/download/community-general-3.8.0.tar.gz to /home/dmsimard/.ansible/tmp/ansible-local-821546820f8vxq/tmplac4iqqg/community-general-3.8.0-jg8r9knz
ERROR! 'url' type is not supported. The format namespace.name is expected.
```

### Expected Results

Either it should work or the help text should be updated.

### Actual Results

```console
> wget https://galaxy.ansible.com/download/community-general-3.8.0.tar.gz
2021-10-19 12:37:28 (8.82 MB/s) - ‘community-general-3.8.0.tar.gz’ saved [2220728/2220728]

> ansible-galaxy collection verify community-general-3.8.0.tar.gz
ERROR! 'file' type is not supported. The format namespace.name is expected.

> ansible-galaxy collection verify https://galaxy.ansible.com/download/community-general-3.8.0.tar.gz
Downloading https://galaxy.ansible.com/download/community-general-3.8.0.tar.gz to /home/dmsimard/.ansible/tmp/ansible-local-821546820f8vxq/tmplac4iqqg/community-general-3.8.0-jg8r9knz
ERROR! 'url' type is not supported. The format namespace.name is expected.
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
roles_path = opt_help.argparse.ArgumentParser(add_help=False)
        roles_path.add_argument('-p', '--roles-path', dest='roles_path', type=opt_help.unfrack_path(pathsep=True),
                                default=C.DEFAULT_ROLES_PATH, action=opt_help.PrependListAction,
                                help='The path to the directory containing your roles. The default is the first '
                                     'writable one configured via DEFAULT_ROLES_PATH: %s ' % default_roles_path)
        collections_path = opt_help.argparse.ArgumentParser(add_help=False)
        collections_path.add_argument('-p', '--collections-path', dest='collections_path', type=opt_help.unfrack_path(pathsep=True),
                                      default=AnsibleCollectionConfig.collection_paths,
                                      action=opt_help.PrependListAction,
                                      help="One or more directories to search for collections in addition "
                                      "to the default COLLECTIONS_PATHS. Separate multiple paths "
                                      "with '{0}'.".format(os.path.pathsep))
        cache_options = opt_help.argparse.ArgumentParser(add_help=False)
        cache_options.add_argument('--clear-response-cache', dest='clear_response_cache', action='store_true',
                                   default=False, help='Clear the existing server response cache.')
        cache_options.add_argument('--no-cache', dest='no_cache', action='store_true', default=False,
                                   help='Do not use the server response cache.')
        
        type_parser = self.parser.add_subparsers(metavar='TYPE', dest='type')
        type_parser.required = True
        
        collection = type_parser.add_parser('collection', help='Manage an Ansible Galaxy collection.')
        collection_parser = collection.add_subparsers(metavar='COLLECTION_ACTION', dest='action')
        collection_parser.required = True
        self.add_download_options(collection_parser, parents=[common, cache_options])
        self.add_init_options(collection_parser, parents=[common, force])
        self.add_build_options(collection_parser, parents=[common, force])
        self.add_publish_options(collection_parser, parents=[common])
        self.add_install_options(collection_parser, parents=[common, force, cache_options])
        self.add_list_options(collection_parser, parents=[common, collections_path])