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/network/cloudengine/ce_vrf.py

@@ -39,12 +39,9 @@ options:
     description:
         description:
             - Description of the vrf, the string length is 1 - 242 .
-        required: false
-        default: null
     state:
         description:
             - Manage the state of the resource.
-        required: false
         choices: ['present','absent']
         default: present
 '''