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/vmware/vca_vapp.py

@@ -31,94 +31,67 @@ options:
         the I(state) is not `absent` then the I(template_name) value must be
         provided.  The I(template_name) must be previously uploaded to the
         catalog specified by I(catalog_name)
-    required: no
-    default: None
   network_name:
     description:
       - The name of the network that should be attached to the virtual machine
         in the vApp.  The virtual network specified must already be created in
         the vCloud Air VDC.  If the I(state) is not 'absent' then the
         I(network_name) argument must be provided.
-    required: no
-    default: None
   network_mode:
     description:
       - Configures the mode of the network connection.
-    required: no
     default: pool
     choices: ['pool', 'dhcp', 'static']
   vm_name:
     description:
       - The name of the virtual machine instance in the vApp to manage.
-    required: no
-    default: None
   vm_cpus:
     description:
       - The number of vCPUs to configure for the VM in the vApp.   If the
         I(vm_name) argument is provided, then this becomes a per VM setting
         otherwise it is applied to all VMs in the vApp.
-    required: no
-    default: None
   vm_memory:
     description:
       - The amount of memory in MB to allocate to VMs in the vApp.  If the
         I(vm_name) argument is provided, then this becomes a per VM setting
         otherise it is applied to all VMs in the vApp.
-    required: no
-    default: None
   operation:
     description:
       - Specifies an operation to be performed on the vApp.
-    required: no
     default: noop
     choices: ['noop', 'poweron', 'poweroff', 'suspend', 'shutdown', 'reboot', 'reset']
   state:
     description:
       - Configures the state of the vApp.
-    required: no
     default: present
     choices: ['present', 'absent', 'deployed', 'undeployed']
   username:
     description:
       - The vCloud Air username to use during authentication
-    required: false
-    default: None
   password:
     description:
       - The vCloud Air password to use during authentication
-    required: false
-    default: None
   org:
     description:
       - The org to login to for creating vapp, mostly set when the service_type is vdc.
-    required: false
-    default: None
   instance_id:
     description:
       - The instance id in a vchs environment to be used for creating the vapp
-    required: false
-    default: None
   host:
     description:
       - The authentication host to be used when service type  is vcd.
-    required: false
-    default: None
   api_version:
     description:
       - The api version to be used with the vca
-    required: false
     default: "5.7"
   service_type:
     description:
       - The type of service we are authenticating against
-    required: false
     default: vca
     choices: [ "vca", "vchs", "vcd" ]
   vdc_name:
     description:
       - The name of the virtual data center (VDC) where the vm should be created or contains the vAPP.
-    required: false
-    default: None
 extends_documentation_fragment: vca
 '''