validate-modules: Fix all system modules (#52384)

This PR includes validate-modules fixes for all system modules.
Except a few that are deliberately implemented like this.

lib/ansible/modules/system/firewalld.py

@@ -7,12 +7,10 @@
 from __future__ import absolute_import, division, print_function
 __metaclass__ = type
 
-
 ANSIBLE_METADATA = {'metadata_version': '1.1',
                     'status': ['preview'],
                     'supported_by': 'community'}
 
-
 DOCUMENTATION = r'''
 ---
 module: firewalld
@@ -57,12 +55,11 @@ options:
     version_added: "2.8"
   zone:
     description:
-      - >
-        The firewalld zone to add/remove to/from (NOTE: default zone can be configured per system but "public" is default from upstream.
+      - The firewalld zone to add/remove to/from.
+      - Note that the default zone can be configured per system but C(public) is default from upstream.
       - Available choices can be extended based on per-system configs, listed here are "out of the box" defaults).
       - Possible values include C(block), C(dmz), C(drop), C(external), C(home), C(internal), C(public), C(trusted), C(work) ]
     type: str
-    default: system-default(public)
   permanent:
     description:
       - Should this configuration be in the running firewalld configuration or persist across reboots.
@@ -109,8 +106,10 @@ notes:
     The module will not take care of this for you implicitly because that would undo any previously performed immediate actions which were not
     permanent. Therefore, if you require immediate access to a newly created zone it is recommended you reload firewalld immediately after the zone
     creation returns with a changed state and before you perform any other immediate, non-permanent actions on that zone.
-requirements: [ 'firewalld >= 0.2.11' ]
-author: "Adam Miller (@maxamillion)"
+requirements:
+- firewalld >= 0.2.11
+author:
+- Adam Miller (@maxamillion)
 '''
 
 EXAMPLES = r'''