### Summary

Running `ansible-doc -l` generates 430 deprecation warnings on stderr before printing anything to stdout.
```
[DEPRECATION WARNING]: amazon.aws.aws_az_facts has been deprecated.
aws_az_facts was renamed in Ansible 2.9 to aws_az_info. Please update your
tasks. This feature will be removed from amazon.aws in a release after
2022-06-01. Deprecation warnings can be disabled by setting
deprecation_warnings=False in ansible.cfg.

[DEPRECATION WARNING]: amazon.aws.aws_caller_facts has been deprecated.
aws_caller_facts was renamed in Ansible 2.9 to aws_caller_info. Please update
your tasks. This feature will be removed from amazon.aws in a release after
2021-12-01. Deprecation warnings can be disabled by setting
deprecation_warnings=False in ansible.cfg.
...
```

### Issue Type

Bug Report

### Component Name

ansible-doc

### Ansible Version

```console
$ ansible-doc --version

ansible-doc 2.10.6
  config file = None
  configured module search path = [u'/home/charleshowes/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python2.7/dist-packages/ansible
  executable location = /usr/local/bin/ansible-doc
  python version = 2.7.17 (default, Sep 30 2020, 13:38:04) [GCC 7.5.0]
```


### Configuration

```console
$ ansible-config dump --only-changed
(no output)
```


### OS / Environment

Ubuntu 18.04

### Steps to Reproduce

<!--- Paste example playbooks or commands between quotes below -->
```shell (paste below)
ansible-doc -l
```


### Expected Results

I expected to see a list of available plugins, and was shocked to have pages and pages of warnings.

### Actual Results

```console
$ ansible-doc -l 2>&1 | head

[DEPRECATION WARNING]: amazon.aws.aws_az_facts has been deprecated. 
aws_az_facts was renamed in Ansible 2.9 to aws_az_info. Please update your 
tasks. This feature will be removed from amazon.aws in a release after 
2022-06-01. Deprecation warnings can be disabled by setting 
deprecation_warnings=False in ansible.cfg.
[DEPRECATION WARNING]: amazon.aws.aws_caller_facts has been deprecated. 
aws_caller_facts was renamed in Ansible 2.9 to aws_caller_info. Please update 
your tasks. This feature will be removed from amazon.aws in a release after 
2021-12-01. Deprecation warnings can be disabled by setting 
deprecation_warnings=False in ansible.cfg.

$ ansible-doc -l 2>&1 | grep -c 'DEPRECATION WARNING'

430
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
warning_text = tombstone.get('warning_text') or ''
                warning_text = '{0} has been removed.{1}{2}'.format(fq_name, ' ' if warning_text else '', warning_text)
                removed_msg = display.get_deprecation_message(msg=warning_text, version=removal_version,
                                                              date=removal_date, removed=True,
                                                              collection_name=acr.collection)
                plugin_load_context.removal_date = removal_date
                plugin_load_context.removal_version = removal_version
                plugin_load_context.resolved = True
                plugin_load_context.exit_reason = removed_msg
                raise AnsiblePluginRemovedError(removed_msg, plugin_load_context=plugin_load_context)
            redirect = routing_metadata.get('redirect', None)
            if redirect:
                
                display.vv("redirecting (type: {0}) {1} to {2}".format(plugin_type, fq_name, redirect))
                
                
                
                if fq_name not in plugin_load_context.redirect_list:
                    plugin_load_context.redirect_list.append(fq_name)
                return plugin_load_context.redirect(redirect)
                
        n_resource = to_native(acr.resource, errors='strict')
        
        full_name = '{0}.{1}'.format(acr.n_python_package_name, n_resource)
        if extension:
            n_resource += extension
        pkg = sys.modules.get(acr.n_python_package_name)
        if not pkg:
            
            try: