Apply suggestions from code review

Co-authored-by: Stan Ulbrych <stan@python.org>

Author: StanFromIreland

Lib/test/test_zoneinfo/test_zoneinfo.py

@@ -1184,7 +1184,7 @@ def test_invalid_tzstr(self):
             # Invalid weekday
             "AAA4BBB,M1.1.7/2,M2.1.1/2",
             "AAA4BBB,M1.1.1/2,M2.1.7/2",
-            # Invalid Mm.w.d separator (must be a literal '.')
+            # Invalid Mm.w.d separator
             "AAA4BBB,M3.2X0,M11.1.0",
             "AAA4BBB,M3.2.0,M11.1X0",
             "AAA4BBB,M3.2-0,M11.1.0/3",

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

@@ -1,3 +1,2 @@
-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.
+Fix the pure-Python :mod:`zoneinfo` parser accepting an invalid POSIX TZ
+transition rule with a non-period separator. Patch by tonghuaroot.