### 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
self.add_verify_options(collection_parser, parents=[common, collections_path])
        
        role = type_parser.add_parser('role', help='Manage an Ansible Galaxy role.')
        role_parser = role.add_subparsers(metavar='ROLE_ACTION', dest='action')
        role_parser.required = True
        self.add_init_options(role_parser, parents=[common, force, offline])
        self.add_remove_options(role_parser, parents=[common, roles_path])
        self.add_delete_options(role_parser, parents=[common, github])
        self.add_list_options(role_parser, parents=[common, roles_path])
        self.add_search_options(role_parser, parents=[common])
        self.add_import_options(role_parser, parents=[common, github])
        self.add_setup_options(role_parser, parents=[common, roles_path])
        self.add_info_options(role_parser, parents=[common, roles_path, offline])
        self.add_install_options(role_parser, parents=[common, force, roles_path])
    def add_download_options(self, parser, parents=None):
        download_parser = parser.add_parser('download', parents=parents,
                                            help='Download collections and their dependencies as a tarball for an '
                                                 'offline install.')
        download_parser.set_defaults(func=self.execute_download)
        download_parser.add_argument('args', help='Collection(s)', metavar='collection', nargs='*')
        download_parser.add_argument('-n', '--no-deps', dest='no_deps', action='store_true', default=False,
                                     help="Don't download collection(s) listed as dependencies.")
        download_parser.add_argument('-p', '--download-path', dest='download_path',
                                     default='./collections',
                                     help='The directory to download the collections to.')
        download_parser.add_argument('-r', '--requirements-file', dest='requirements',
                                     help='A file containing a list of collections to be downloaded.')
        download_parser.add_argument('--pre', dest='allow_pre_release', action='store_true',
                                     help='Include pre-release versions. Semantic versioning pre-releases are ignored by default')
    def add_init_options(self, parser, parents=None):