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_mtu.py

@@ -35,31 +35,22 @@ options:
     interface:
         description:
             - Full name of interface, i.e. 40GE1/0/22.
-        required: false
-        default: null
     mtu:
         description:
             - MTU for a specific interface.
               The value is an integer ranging from 46 to 9600, in bytes.
-        required: false
-        default: null
     jumbo_max:
         description:
             - Maximum frame size. The default value is 9216.
               The value is an integer and expressed in bytes. The value range is 1536 to 12224 for the CE12800
               and 1536 to 12288 for ToR switches.
-        required: false
-        default: null
     jumbo_min:
         description:
             - Non-jumbo frame size threshod. The default value is 1518.
               The value is an integer that ranges from 1518 to jumbo_max, in bytes.
-        required: false
-        default: null
     state:
         description:
             - Specify desired state of the resource.
-        required: false
         default: present
         choices: ['present','absent']
 '''