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/system/selinux_permissive.py

@@ -30,20 +30,17 @@ options:
     description:
         - "indicate if the domain should or should not be set as permissive"
     required: true
-    choices: [ 'True', 'False' ]
+    type: bool
   no_reload:
     description:
         - "automatically reload the policy after a change"
         - "default is set to 'false' as that's what most people would want after changing one domain"
         - "Note that this doesn't work on older version of the library (example EL 6), the module will silently ignore it in this case"
-    required: false
-    default: False
-    choices: [ 'True', 'False' ]
+    type: bool
+    default: 'no'
   store:
     description:
       - "name of the SELinux policy store to use"
-    required: false
-    default: null
 notes:
     - Requires a version of SELinux recent enough ( ie EL 6 or newer )
 requirements: [ policycoreutils-python ]