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/ce.py

@@ -24,7 +24,6 @@ options:
   provider:
     description:
       - A dict object containing connection details.
-    default: null
     suboptions:
       host:
         description:
@@ -38,7 +37,6 @@ options:
             device.  This value applies to either I(cli) or I(netconf).  The port
             value will default to the appropriate transport common port if
             none is provided in the task.  (cli=22, netconf=22).
-        required: false
         default: 0 (use common port)
       username:
         description:
@@ -46,22 +44,18 @@ options:
             the remote device.  This value is used to authenticate the CLI login.
             If the value is not specified in the task, the value of environment
             variable C(ANSIBLE_NET_USERNAME) will be used instead.
-        required: false
       password:
         description:
           - Specifies the password to use to authenticate the connection to
             the remote device.  This is a common argument used for cli
             transports. If the value is not specified in the task, the
             value of environment variable C(ANSIBLE_NET_PASSWORD) will be used instead.
-        required: false
-        default: null
       ssh_keyfile:
         description:
           - Specifies the SSH key to use to authenticate the connection to
             the remote device.  This argument is used for the I(cli)
             transport. If the value is not specified in the task, the
             value of environment variable C(ANSIBLE_NET_SSH_KEYFILE) will be used instead.
-        required: false
       transport:
         description:
           - Configures the transport connection to use when connecting to the