##### SUMMARY
With the introduction of `Collection` mechanism using the `ansible-galaxy` CLI, the command and sub command help texts should be reflecting the new feature. The CLI currently validates the `collection` sub-command but the help text is still saying `role` is the only valid sub-command.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
`ansible-galaxy`

##### ANSIBLE VERSION
```
ansible 2.9.7
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/dvercill/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/dvercill/.local/lib/python3.8/site-packages/ansible
  executable location = /home/dvercill/.local/bin/ansible
  python version = 3.8.2 (default, Feb 28 2020, 00:00:00) [GCC 10.0.1 20200216 (Red Hat 10.0.1-0.8)]
```

##### CONFIGURATION
N/A

##### OS / ENVIRONMENT
Fedora Workstation 32 beta

##### STEPS TO REPRODUCE
```
$ ansible-galaxy doesnotexist
usage: ansible-galaxy role [-h] ROLE_ACTION ...
ansible-galaxy role: error: argument ROLE_ACTION: invalid choice: 'doesnotexist' (choose from 'init', 'remove', 'delete', 'list', 'search', 'import', 'setup', 'login', 'info', 'install')
```
''' check for conflicting options '''
        if fork_opts:
            if op.forks < 1:
                self.parser.error("The number of processes (--forks) must be >= 1")
        return op
    @abstractmethod
    def init_parser(self, usage="", desc=None, epilog=None):
        """
        Create an options parser for most ansible scripts
        Subclasses need to implement this method.  They will usually call the base class's
        init_parser to create a basic version and then add their own options on top of that.
        An implementation will look something like this::
            def init_parser(self):
                super(MyCLI, self).init_parser(usage="My Ansible CLI", inventory_opts=True)
                ansible.arguments.option_helpers.add_runas_options(self.parser)
                self.parser.add_option('--my-option', dest='my_option', action='store')
        """
        self.parser = opt_help.create_base_parser(os.path.basename(self.args[0]), usage=usage, desc=desc, epilog=epilog, )
    @abstractmethod
    def post_process_args(self, options):