[Feature #21932] [DOC] Mention MatchData#integer_at in NEWS.md

Author: nobu

NEWS.md

@@ -26,6 +26,11 @@ Note: We're only listing outstanding class updates.
       directory without hardcoding absolute paths or manipulating `$LOAD_PATH`.
       [[Feature #15330]]
 
+* MatchData
+
+    * `MatchData#integer_at` is added.  It converts the matched substring to
+      integer and return the result.  [[Feature #21932]]
+
 * Method
 
     * `Method#source_location`, `Proc#source_location`, and
@@ -130,6 +135,7 @@ A lot of work has gone into making Ractors more stable, performant, and usable.
 [Feature #15330]: https://bugs.ruby-lang.org/issues/15330
 [Feature #21390]: https://bugs.ruby-lang.org/issues/21390
 [Feature #21785]: https://bugs.ruby-lang.org/issues/21785
+[Feature #21932]: https://bugs.ruby-lang.org/issues/21932
 [test-unit-3.7.4]: https://github.com/test-unit/test-unit/releases/tag/3.7.4
 [test-unit-3.7.5]: https://github.com/test-unit/test-unit/releases/tag/3.7.5
 [rss-0.3.2]: https://github.com/ruby/rss/releases/tag/0.3.2