Add trailing newline to NEWS entry

Author: tonghuaroot

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

@@ -3,4 +3,4 @@ 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.
+tonghuaroot.