announce-gen: Accommodate alternative NEWS formats.

Update ChangeLog.

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-2025-11-15  Basil L. Contovounesios  <basil@contovou.net>
+2025-11-26  Basil L. Contovounesios  <basil@contovou.net>
+
+       announce-gen: Accommodate alternative NEWS formats.
+       Suggested by Simon Josefsson <simon@josefsson.org> in:
+       <https://lists.gnu.org/r/bug-gnulib/2025-11/msg00154.html>.
+       * build-aux/announce-gen (print_news_deltas): Accept Markdown
+       ATX-style '#' headings in addition to outline-mode '*' headings.
+       Allow multiple repetitions of the heading marker.
+
+2025-11-26  Basil L. Contovounesios  <basil@contovou.net>
 
        maintainer-makefile: Auto-detect NEWS.md.
        Suggested by Simon Josefsson <simon@josefsson.org> in: