Tidy up validate-modules ignores doc-required-mismatch

plugins/modules/system/aix_devices.py

@@ -25,7 +25,6 @@ options:
     - The name of the device.
     - C(all) is valid to rescan C(available) all devices (AIX cfgmgr command).
     type: str
-    required: true
   force:
     description:
     - Forces action.

plugins/modules/system/osx_defaults.py

@@ -36,7 +36,6 @@ options:
     description:
       - The key of the user preference.
     type: str
-    required: true
   type:
     description:
       - The type of value to write.