Move __cached__ deprecation notice to its own attribute section and clean up __file__ docs

Author: gourijain029-del

Doc/reference/datamodel.rst

@@ -1084,14 +1084,12 @@ this approach.
    :ref:`import system <importsystem>` may opt to leave it unset if it
    has no semantic meaning (for example, a module loaded from a database).
 
-   .. deprecated-removed:: 3.13 3.15
-      Setting ``__cached__`` on a module while failing to set
-      :attr:`!__spec__.cached` is deprecated. In Python 3.15,
-      ``__cached__`` will cease to be set or taken into consideration by
-      the import system or standard library.
+.. attribute:: module.__cached__
+
+   The ``__cached__`` attribute stores the path to the compiled byte‑code file for a module.
+   It is deprecated and will be removed in Python 3.15.
+
 
-   .. versionchanged:: 3.15
-      ``__cached__`` is no longer set.
 
 Other writable attributes on module objects
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^