doc: add more info to v14 changelog

PR-URL: #32979
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

doc/changelogs/CHANGELOG_V14.md

@@ -79,6 +79,10 @@ interact with `std::shared_ptr`. This is expected to be fixed in a later version
 #### Update to V8 8.1
 
 * **(SEMVER-MAJOR)** **deps**: update V8 to 8.1.307.20 (Matheus Marchini) [#32116](https://github.com/nodejs/node/pull/32116)
+  * Enables Optional Chaining by default ([MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining), [v8.dev](https://v8.dev/features/optional-chaining))
+  * Enables Nullish Coalescing by default ([MDN](https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_Coalescing_Operator), [v8.dev](https://v8.dev/features/nullish-coalescing))
+  * Enables `Intl.DisplayNames` by default ([MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DisplayNames), [v8.dev](https://v8.dev/features/intl-displaynames))
+  * Enables `calendar` and `numberingSystem` options for `Intl.DateTimeFormat` by default ([MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DateTimeFormat))
 
 #### Other Notable Changes: