Update license and blurb

Author: tiran

Misc/NEWS.d/next/Library/2022-03-23-10-07-41.bpo-47098.7AN_qp.rst

@@ -1,2 +1,3 @@
-The Keccak Code Package for :mod:`hashlib`'s SHA3 and SHAKE algorithms has
-been replaced with tiny_sha3.
+The Keccak Code Package for :mod:`hashlib`'s internal ``_sha3`` module has
+been replaced with tiny_sha3. The module is used as fallback when Python is
+built without OpenSSL.