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/a10/a10_server_axapi3.py

@@ -40,7 +40,6 @@ options:
   server_status:
     description:
       - The SLB (Server Load Balancer) virtual server status.
-    required: false
     default: enable
     aliases: ['action']
     choices: ['enable', 'disable']
@@ -48,23 +47,19 @@ options:
     description:
       - A list of ports to create for the server. Each list item should be a dictionary which specifies the C(port:)
         and C(protocol:).
-    required: false
-    default: null
     aliases: ['port']
   operation:
     description:
       - Create, Update or Remove SLB server. For create and update operation, we use the IP address and server
         name specified in the POST message. For delete operation, we use the server name in the request URI.
-    required: false
     default: create
     choices: ['create', 'update', 'remove']
   validate_certs:
     description:
       - If C(no), SSL certificates will not be validated. This should only be used
         on personally controlled devices using self-signed certificates.
-    required: false
+    type: bool
     default: 'yes'
-    choices: ['yes', 'no']
 
 '''