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/utils/module_docs_fragments/aws.py

@@ -26,42 +26,28 @@ options:
       - Url to use to connect to EC2 or your Eucalyptus cloud (by default the module will use EC2 endpoints).
         Ignored for modules where region is required. Must be specified for all other modules if region is not used.
         If not set then the value of the EC2_URL environment variable, if any, is used.
-    required: false
-    default: null
-    aliases: []
   aws_secret_key:
     description:
       - AWS secret key. If not set then the value of the AWS_SECRET_ACCESS_KEY, AWS_SECRET_KEY, or EC2_SECRET_KEY environment variable is used.
-    required: false
-    default: null
     aliases: [ 'ec2_secret_key', 'secret_key' ]
   aws_access_key:
     description:
       - AWS access key. If not set then the value of the AWS_ACCESS_KEY_ID, AWS_ACCESS_KEY or EC2_ACCESS_KEY environment variable is used.
-    required: false
-    default: null
     aliases: [ 'ec2_access_key', 'access_key' ]
   security_token:
     description:
       - AWS STS security token. If not set then the value of the AWS_SECURITY_TOKEN or EC2_SECURITY_TOKEN environment variable is used.
-    required: false
-    default: null
     aliases: [ 'access_token' ]
     version_added: "1.6"
   validate_certs:
     description:
       - When set to "no", SSL certificates will not be validated for boto versions >= 2.6.0.
-    required: false
-    default: "yes"
     type: bool
-    aliases: []
+    default: 'yes'
     version_added: "1.5"
   profile:
     description:
       - Uses a boto profile. Only works with boto >= 2.24.0.
-    required: false
-    default: null
-    aliases: []
     version_added: "1.6"
 requirements:
   - "python >= 2.6"