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/amazon/ec2_eip.py

@@ -31,45 +31,37 @@ options:
       - The IP address of a previously allocated EIP.
       - If present and device is specified, the EIP is associated with the device.
       - If absent and device is specified, the EIP is disassociated from the device.
-    required: false
     aliases: [ ip ]
   state:
     description:
       - If present, allocate an EIP or associate an existing EIP with a device.
       - If absent, disassociate the EIP from the device and optionally release it.
-    required: false
     choices: ['present', 'absent']
     default: present
   in_vpc:
     description:
       - Allocate an EIP inside a VPC or not. Required if specifying an ENI.
-    required: false
-    default: false
+    default: 'no'
     version_added: "1.4"
   reuse_existing_ip_allowed:
     description:
       - Reuse an EIP that is not associated to a device (when available), instead of allocating a new one.
-    required: false
-    default: false
+    default: 'no'
     version_added: "1.6"
   release_on_disassociation:
     description:
       - whether or not to automatically release the EIP when it is disassociated
-    required: false
-    default: false
+    default: 'no'
     version_added: "2.0"
   private_ip_address:
     description:
       - The primary or secondary private IP address to associate with the Elastic IP address.
-    required: False
-    default: None
     version_added: "2.3"
   allow_reassociation:
     description:
       -  Specify this option to allow an Elastic IP address that is already associated with another
          network interface or instance to be re-associated with the specified instance or interface.
-    required: false
-    default: false
+    default: 'no'
     version_added: "2.5"
 extends_documentation_fragment:
     - aws