Update What's New in Python 3.8 (GH-14239)

* Mention issue in which ByByteArray_Init() has been removed.
* Fix typo

Doc/whatsnew/3.8.rst

@@ -1001,6 +1001,7 @@ Build and C API Changes
 * The :c:func:`PyByteArray_Init` and :c:func:`PyByteArray_Fini` functions have
   been removed. They did nothing since Python 2.7.4 and Python 3.2.0, were
   excluded from the limited API (stable ABI), and were not documented.
+  (Contributed by Victor Stinner in :issue:`32980`.)
 
 * The result of :c:func:`PyExceptionClass_Name` is now of type
   ``const char *`` rather of ``char *``.