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/rackspace/rax_clb.py

@@ -32,11 +32,9 @@ options:
   meta:
     description:
       - A hash of metadata to associate with the instance
-    default: null
   name:
     description:
       - Name to give the load balancer
-    default: null
   port:
     description:
       - Port for the balancer being created
@@ -90,10 +88,8 @@ options:
   wait:
     description:
       - wait for the balancer to be in state 'running' before returning
-    default: "no"
-    choices:
-      - "yes"
-      - "no"
+    type: bool
+    default: 'no'
   wait_timeout:
     description:
       - how long before wait gives up, in seconds