Fix-up the XXX for importlib.abc.

Doc/whatsnew/3.2.rst

@@ -326,10 +326,12 @@ aspects that are visible to the programmer:
 * The :mod:`py_compile` and :mod:`compileall` modules have been updated to
   reflect the new naming convention and target directory.
 
-* XXX The :mod:`importlib.abc` module has been updated with new ABCs that
-  abstract out bytecode file details; some other ABCs in the module are now
-  deprecated in favor for the new ABCs (instructions on how to stay
-  backwards-compatible with Python 3.1 are included with the documentation).
+* The :mod:`importlib.abc` module has been updated with new :term:`abstract base
+  classes <abstract base class>` for the loading bytecode files.  The now
+  obsolete ABCS, :class:`~importlib.abc.PyLoader` and
+  :class:`~importlib.abc.PyPycLoader`, have been deprecated (instructions on how
+  to stay backwards-compatible with Python 3.1 are included with the
+  documentation).
 
 .. seealso::