Update 2.13.11.md

Author: SethTisue

releases/2.13.11.md

@@ -12,6 +12,7 @@ The following changes are highlights of this release:
 ### Compatibility
 
 * Support JDK 20 and 21 by upgrading to ASM 9.5 ([#10363](https://github.com/scala/scala/pull/10363), [#10184](https://github.com/scala/scala/pull/10184) by [@Philippus](https://github.com/Philippus))
+* Fix crash reading JDK 21 classfiles ([#10397](https://github.com/scala/scala/pull/10397))
 * Support Java 17 `sealed` in Java sources and classfiles ([#10348](https://github.com/scala/scala/pull/10348), [#10105](https://github.com/scala/scala/pull/10105) by [@som-snytt](https://github.com/som-snytt))
 
 ### Align with Scala 3
@@ -44,6 +45,8 @@ The following changes are highlights of this release:
 * Provide `equals` and `hashCode` on `IterableWrapper` again (fixing 2.13.9 regression) ([#10205](https://github.com/scala/scala/pull/10205) by [@som-snytt](https://github.com/som-snytt))
 * Improvements to `-Vimplicits`; errors now show complete implicit search tree ([#9944](https://github.com/scala/scala/pull/9944) by [@tribbloid](https://github.com/tribbloid))
 
+2.13.11 also includes the changes from Scala 2.12.18. (A few of the most significant, such as those involving JDK 20 and 21 compatibility, are listed above.)
+
 For the complete 2.13.11 change lists, see [all merged PRs](https://github.com/scala/scala/pulls?q=is%3Amerged%20milestone%3A2.13.11) and [all closed bugs](https://github.com/scala/bug/issues?utf8=%E2%9C%93&q=is%3Aclosed+milestone%3A2.13.11).
 
 ## Compatibility