Document boolean default value treatment (#30062)

* Consistency and document treatment of default bool values

* Document that default bool values can be any Ansible recognized bool.
  choose the one that reads better in context
* For fragments used by the copy module, make bool types use type=bool and not choices

* Edit for clarity

lib/ansible/utils/module_docs_fragments/files.py

@@ -69,6 +69,7 @@ options:
          they cannot be updated atomically and can only be done in an unsafe manner.
       -  This boolean option allows ansible to fall back to unsafe methods of updating files for those cases in which you do
          not have any other choice. Be aware that this is subject to race conditions and can lead to data corruption.
+    type: bool
     required: false
     default: false
     version_added: "2.2"