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/cloudstack/cs_affinitygroup.py

@@ -39,40 +39,29 @@ options:
   affinity_type:
     description:
       - Type of the affinity group. If not specified, first found affinity type is used.
-    required: false
-    default: null
     aliases: [ affinty_type ]
   description:
     description:
       - Description of the affinity group.
-    required: false
-    default: null
   state:
     description:
       - State of the affinity group.
-    required: false
     default: 'present'
     choices: [ 'present', 'absent' ]
   domain:
     description:
       - Domain the affinity group is related to.
-    required: false
-    default: null
   account:
     description:
       - Account the affinity group is related to.
-    required: false
-    default: null
   project:
     description:
       - Name of the project the affinity group is related to.
-    required: false
-    default: null
   poll_async:
     description:
       - Poll async jobs until job has finished.
-    required: false
-    default: true
+    type: bool
+    default: 'yes'
 extends_documentation_fragment: cloudstack
 '''