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_vxlan_gateway.py

@@ -36,101 +36,72 @@ options:
         description:
             - Specifies the ID of a DFS group.
               The value must be 1.
-        required: false
-        default: null
     dfs_source_ip:
         description:
             - Specifies the IPv4 address bound to a DFS group.
               The value is in dotted decimal notation.
-        required: false
-        default: null
     dfs_source_vpn:
         description:
             - Specifies the name of a VPN instance bound to a DFS group.
               The value is a string of 1 to 31 case-sensitive characters without spaces.
               If the character string is quoted by double quotation marks, the character string can contain spaces.
               The value C(_public_) is reserved and cannot be used as the VPN instance name.
-        required: false
-        default: null
     dfs_udp_port:
         description:
             - Specifies the UDP port number of the DFS group.
               The value is an integer that ranges from 1025 to 65535.
-        required: false
-        default: null
     dfs_all_active:
         description:
             - Creates all-active gateways.
-        required: false
         choices: ['enable', 'disable']
-        default: null
     dfs_peer_ip:
         description:
             - Configure the IP address of an all-active gateway peer.
               The value is in dotted decimal notation.
-        required: false
-        default: null
     dfs_peer_vpn:
         description:
             - Specifies the name of the VPN instance that is associated with all-active gateway peer.
               The value is a string of 1 to 31 case-sensitive characters, spaces not supported.
               When double quotation marks are used around the string, spaces are allowed in the string.
               The value C(_public_) is reserved and cannot be used as the VPN instance name.
-        required: false
-        default: null
     vpn_instance:
         description:
             - Specifies the name of a VPN instance.
               The value is a string of 1 to 31 case-sensitive characters, spaces not supported.
               When double quotation marks are used around the string, spaces are allowed in the string.
               The value C(_public_) is reserved and cannot be used as the VPN instance name.
-        required: false
-        default: null
     vpn_vni:
         description:
             - Specifies a VNI ID.
               Binds a VXLAN network identifier (VNI) to a virtual private network (VPN) instance.
               The value is an integer ranging from 1 to 16000000.
-        required: false
-        default: null
     vbdif_name:
         description:
             - Full name of VBDIF interface, i.e. Vbdif100.
-        required: false
-        default: null
     vbdif_bind_vpn:
         description:
             - Specifies the name of the VPN instance that is associated with the interface.
               The value is a string of 1 to 31 case-sensitive characters, spaces not supported.
               When double quotation marks are used around the string, spaces are allowed in the string.
               The value C(_public_) is reserved and cannot be used as the VPN instance name.
-        required: false
-        default: null
     vbdif_mac:
         description:
             - Specifies a MAC address for a VBDIF interface.
               The value is in the format of H-H-H. Each H is a 4-digit hexadecimal number, such as C(00e0) or C(fc01).
               If an H contains less than four digits, 0s are added ahead. For example,  C(e0) is equal to C(00e0).
               A MAC address cannot be all 0s or 1s or a multicast MAC address.
-        required: false
-        default: null
     arp_distribute_gateway:
         description:
             - Enable the distributed gateway function on VBDIF interface.
-        required: false
         choices: ['enable','disable']
-        default: null
     arp_direct_route:
         description:
             - Enable VLINK direct route on VBDIF interface.
-        required: false
         choices: ['enable','disable']
-        default: null
     state:
         description:
             - Determines whether the config should be present or not
               on the device.
-        required: false
         default: present
         choices: ['present', 'absent']
 """