clarify cacheable (#75085)

* clarify cacheable

* Update lib/ansible/modules/set_fact.py

Co-authored-by: Abhijeet Kasurde <akasurde@redhat.com>

Co-authored-by: Abhijeet Kasurde <akasurde@redhat.com>

lib/ansible/modules/set_fact.py

@@ -28,7 +28,8 @@ options:
     required: true
   cacheable:
     description:
-      - This boolean converts the variable into an actual 'fact' which will also be added to the fact cache, if fact caching is enabled.
+      - This boolean converts the variable into an actual 'fact' which will also be added to the fact cache.
+        It does not enable fact caching across runs, it just means it will work with it if already enabled.
       - Normally this module creates 'host level variables' and has much higher precedence, this option changes the nature and precedence
         (by 7 steps) of the variable created.
         U(https://docs.ansible.com/ansible/latest/user_guide/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable)