Document GH-24624

diff --git a/Misc/NEWS.d/next/Build/2021-03-31-12-20-23.bpo-43179.Qbe1OD.rst b/Misc/NEWS.d/next/Build/2021-03-31-12-20-23.bpo-43179.Qbe1OD.rst
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+Introduce and correctly use ALIGNOF_X in place of SIZEOF_X for
+alignment-related code in optimized string routines. Patch by Jessica
+Clarke.
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