Fix NEWS entry reference

Author: tfzee

Misc/NEWS.d/next/Library/2026-10-01-18-46-33.gh-issue-158570.rixXY7.rst

@@ -1,3 +1,4 @@
-Fix a deadlock in :meth:`concurrent.futures.ProcessPoolExecutor.shutdown`
-when the pipe used to return results fills up with worker exit
-notifications.
+Fix a deadlock in :meth:`ProcessPoolExecutor.shutdown()
+<concurrent.futures.Executor.shutdown>` when the messages that exiting
+workers send back fill up the pipe used to return results. This could
+happen with many workers or a small pipe buffer.