Clean up module documentation (#36909)

* Clean up module documentation

This PR includes:
- Removal of `default: None` (and variations)
- Removal of `required: false`
- Fixing booleans and `type: bool` where required

* Fix remaining (new) validation issues

lib/ansible/modules/cloud/openstack/os_server_facts.py

@@ -31,18 +31,15 @@ options:
      description:
        - restrict results to servers with names or UUID matching
          this glob expression (e.g., <web*>).
-     required: false
-     default: None
    detailed:
      description:
         - when true, return additional detail about servers at the expense
           of additional API calls.
-     required: false
-     default: false
+     type: bool
+     default: 'no'
    availability_zone:
      description:
        - Ignored. Present for backwards compatibility
-     required: false
 extends_documentation_fragment: openstack
 '''