PEP 646: Add Stephan's endorsement to Acknowledgements section (#1915)

Author: mrahtz

pep-0646.rst

@@ -790,10 +790,10 @@ Acknowledgements
 
 Thank you to **Alfonso Castaño**, **Antoine Pitrou**, **Bas v.B.**, **David Foster**, **Dimitris Vardoulakis**, **Eric Traut**, **Guido van Rossum**, **Jia Chen**,
 **Lucio Fernandez-Arjona**, **Nikita Sobolev**, **Peilonrayz**, **Rebecca Chen**,
-**Sergei Lebedev** and **Vladimir Mikulik** for helpful feedback and suggestions on
+**Sergei Lebedev**, and **Vladimir Mikulik** for helpful feedback and suggestions on
 drafts of this PEP.
 
-Thank you especially to **Lucio**, for suggesting the star syntax, which has made multiple aspects of this proposal much more concise and intuitive.
+Thank you especially to **Lucio** for suggesting the star syntax (which has made multiple aspects of this proposal much more concise and intuitive), and to **Stephan Hoyer** for his kind `endorsement`_ of the PEP on the python-dev mailing list.
 
 Resources
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@@ -846,6 +846,8 @@ References
 
 .. _this exercise: https://spinningup.openai.com/en/latest/spinningup/exercise2_2_soln.html
 
+.. _endorsement: https://mail.python.org/archives/list/python-dev@python.org/message/UDM7Y6HLHQBKXQEBIBD5ZLB5XNPDZDXV/
+
 Copyright
 =========