Add cross-compilation to changelog

Change-Id: I8e06557e621351e1af13ec6cb9dfd715d2847740
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/428280
Reviewed-by: Alexander Thomas <[email protected]>
Commit-Queue: Ivan Inozemtsev <[email protected]>

Author: iinozemtsev

CHANGELOG.md

@@ -169,6 +169,12 @@ disallowed.
 
 Removed the `--experiment-new-rti` and `--use-old-rti` flags.
 
+#### Dart Native Compiler
+
+Added
+[cross-compilation](https://dart.dev/tools/dart-compile#cross-compilation-exe)
+for the Linux x64 and Linux ARM64 target platforms.
+
 #### Dart format
 
 In 3.7.0, we released a largely rewritten formatter supporting a new