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_evpn_bgp.py

@@ -36,48 +36,33 @@ options:
     as_number:
         description:
             - Specifies integral AS number. The value is an integer ranging from 1 to 4294967295.
-        required: False
-        default: null
     peer_address:
         description:
             - Specifies the IPv4 address of a BGP EVPN peer. The value is in dotted decimal notation.
-        required: False
-        default: null
     peer_group_name:
         description:
             - Specify the name of a peer group that BGP peers need to join.
               The value is a string of 1 to 47 case-sensitive characters, spaces not supported.
-        required: False
-        default: null
     peer_enable:
         description:
             - Enable or disable a BGP device to exchange routes with a specified peer or peer group in the address
               family view.
-        required: False
-        default: null
         choices: ['true','false']
     advertise_router_type:
         description:
             - Configures a device to advertise routes to its BGP EVPN peers.
-        required: False
-        default: null
         choices: ['arp','irb']
     vpn_name:
         description:
             - Associates a specified VPN instance with the IPv4 address family.
               The value is a string of 1 to 31 case-sensitive characters, spaces not supported.
-        required: False
-        default: null
     advertise_l2vpn_evpn:
         description:
             - Enable or disable a device to advertise IP routes imported to a VPN instance to its EVPN instance.
-        required: False
-        default: null
         choices: ['enable','disable']
     state:
         description:
             - Manage the state of the resource.
-        required: False
         default: present
         choices: ['present','absent']
 '''