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_elb_lb.py

@@ -38,19 +38,19 @@ options:
   purge_listeners:
     description:
       - Purge existing listeners on ELB that are not found in listeners
-    required: false
-    default: true
+    type: bool
+    default: 'yes'
   instance_ids:
     description:
       - List of instance ids to attach to this ELB
-    required: false
-    default: false
+    type: bool
+    default: 'no'
     version_added: "2.1"
   purge_instance_ids:
     description:
       - Purge existing instance ids on ELB that are not found in instance_ids
-    required: false
-    default: false
+    type: bool
+    default: 'no'
     version_added: "2.1"
   zones:
     description:
@@ -59,43 +59,31 @@ options:
   purge_zones:
     description:
       - Purge existing availability zones on ELB that are not found in zones
-    required: false
-    default: false
+    type: bool
+    default: 'no'
   security_group_ids:
     description:
       - A list of security groups to apply to the elb
-    required: false
-    default: None
     version_added: "1.6"
   security_group_names:
     description:
       - A list of security group names to apply to the elb
-    required: false
-    default: None
     version_added: "2.0"
   health_check:
     description:
       - An associative array of health check configuration settings (see example)
-    required: false
-    default: None
   access_logs:
     description:
       - An associative array of access logs configuration settings (see example)
-    required: false
-    default: None
     version_added: "2.0"
   subnets:
     description:
       - A list of VPC subnets to use when creating ELB. Zones should be empty if using this.
-    required: false
-    default: None
-    aliases: []
     version_added: "1.7"
   purge_subnets:
     description:
       - Purge existing subnet on ELB that are not found in subnets
-    required: false
-    default: false
+    default: 'no'
     version_added: "1.7"
   scheme:
     description:
@@ -103,60 +91,48 @@ options:
         If you choose to update your scheme with a different value the ELB will be destroyed and
         recreated. To update scheme you must use the option wait.
     choices: ["internal", "internet-facing"]
-    required: false
     default: 'internet-facing'
     version_added: "1.7"
   validate_certs:
     description:
       - When set to "no", SSL certificates will not be validated for boto versions >= 2.6.0.
-    required: false
-    default: "yes"
-    choices: ["yes", "no"]
-    aliases: []
+    type: bool
+    default: 'yes'
     version_added: "1.5"
   connection_draining_timeout:
     description:
       - Wait a specified timeout allowing connections to drain before terminating an instance
-    required: false
-    aliases: []
     version_added: "1.8"
   idle_timeout:
     description:
       - ELB connections from clients and to servers are timed out after this amount of time
-    required: false
     version_added: "2.0"
   cross_az_load_balancing:
     description:
       - Distribute load across all configured Availability Zones
-    required: false
-    default: "no"
-    choices: ["yes", "no"]
-    aliases: []
+    type: bool
+    default: 'no'
     version_added: "1.8"
   stickiness:
     description:
       - An associative array of stickiness policy settings. Policy will be applied to all listeners ( see example )
-    required: false
     version_added: "2.0"
   wait:
     description:
       - When specified, Ansible will check the status of the load balancer to ensure it has been successfully
         removed from AWS.
-    required: false
-    default: no
-    choices: ["yes", "no"]
+    type: bool
+    default: 'no'
     version_added: "2.1"
   wait_timeout:
     description:
       - Used in conjunction with wait. Number of seconds to wait for the elb to be terminated.
         A maximum of 600 seconds (10 minutes) is allowed.
-    required: false
     default: 60
     version_added: "2.1"
   tags:
     description:
       - An associative array of tags. To delete all tags, supply an empty dict.
-    required: false
     version_added: "2.1"
 
 extends_documentation_fragment: