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/docker.py

@@ -26,7 +26,6 @@ options:
             - "The URL or Unix socket path used to connect to the Docker API. To connect to a remote host, provide the
               TCP connection string. For example, 'tcp://192.0.2.23:2376'. If TLS is used to encrypt the connection,
               the module will automatically replace 'tcp' in the connection URL with 'https'."
-        required: false
         default: "unix://var/run/docker.sock"
         aliases:
             - docker_url
@@ -34,55 +33,43 @@ options:
         description:
             - When verifying the authenticity of the Docker Host server, provide the expected name of the server.
         default: localhost
-        required: false
     api_version:
         description:
             - The version of the Docker API running on the Docker Host. Defaults to the latest version of the API
               supported by docker-py.
-        required: false
         default: default provided by docker-py
         aliases:
             - docker_api_version
     timeout:
         description:
             - The maximum amount of time in seconds to wait on a response from the API.
-        required: false
         default: 60
     cacert_path:
         description:
             - Use a CA certificate when performing server verification by providing the path to a CA certificate file.
-        required: false
-        default: null
         aliases:
             - tls_ca_cert
     cert_path:
         description:
             - Path to the client's TLS certificate file.
-        required: false
-        default: null
         aliases:
             - tls_client_cert
     key_path:
         description:
             - Path to the client's TLS key file.
-        required: false
-        default: null
         aliases:
             - tls_client_key
     ssl_version:
         description:
             - Provide a valid SSL version number. Default value determined by docker-py, currently 1.0.
-        required: false
         default: "1.0"
     tls:
         description:
             -  Secure the connection to the API by using TLS without verifying the authenticity of the Docker host
                server.
-        default: false
     tls_verify:
         description:
             - Secure the connection to the API by using TLS and verifying the authenticity of the Docker host server.
-        default: false
 
 notes:
     - Connect to the Docker daemon by providing parameters with each task or by defining environment variables.