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/network/cloudengine/ce_file_copy.py

@@ -45,8 +45,6 @@ options:
             - Remote file path of the copy. Remote directories must exist.
               If omitted, the name of the local file will be used.
               The maximum length of I(remote_file) is C(4096).
-        required: false
-        default: null
     file_system:
         description:
             - The remote file system of the device. If omitted,
@@ -59,7 +57,6 @@ options:
               3) C(chassis ID/slot number#flash) is root directory of the flash memory on
                  a device in a stack. For example, C(1/5#flash) indicates the flash memory
                  whose chassis ID is 1 and slot number is 5.
-        required: false
         default: 'flash:'
 '''