Issue #15814: Add NEWS entry regarding intended memoryview hashing restrictions

Misc/NEWS

@@ -52,6 +52,14 @@ Build
 - Issue #15822: Really ensure 2to3 grammar pickles are properly installed
   (replaces fixes for Issue #15645).
 
+Documentation
+-------------
+
+- Issue #15814: The memoryview enhancements in 3.3.0 accidentally permitted
+  the hashing of multi-dimensional memorviews and memoryviews with multi-byte
+  item formats. The intended restrictions have now been documented - they
+  will be correctly enforced in 3.3.1
+
 
 What's New in Python 3.3.0 Release Candidate 1?
 ===============================================