whatsnew/3.5: Mention issue 22464

(About the only new feature that was worth mentioning in
whatsnew without a NEWS entry)

Doc/whatsnew/3.5.rst

@@ -1355,6 +1355,9 @@ The following performance enhancements have been added:
 * property() getter calls are up to 25% faster.
   (Contributed by Joe Jevnik in :issue:`23910`.)
 
+* Instantiation of :class:`fractions.Fraction` is now up to 30% faster.
+  (Contributed by Stefan Behnel in :issue:`22464`.)
+
 
 Build and C API Changes
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