Simplify NEWS entry

Author: tonghuaroot

Misc/NEWS.d/next/Library/2026-06-26-12-50-26.gh-issue-152246.MfXMd1.rst

@@ -1,6 +1,3 @@
-Fixed a parity bug in the pure-Python :mod:`zoneinfo` implementation, which
-accepted a POSIX TZ ``Mm.w.d`` transition rule whose third separator was not a
-period (for example ``M3.2X0``). Only the first period was escaped in the
-regular expression, so the third one matched any character. Such a string is
-invalid per POSIX and is already rejected by the C accelerator. Patch by
-tonghuaroot.
+Fix the pure-Python :mod:`zoneinfo` parser accepting a POSIX TZ ``Mm.w.d``
+transition rule with a non-period separator (for example ``M3.2X0``), which
+the C implementation already rejects. Patch by tonghuaroot.