doc(rl-24.05): zx v8 breaking changes

nixos/doc/manual/release-notes/rl-2405.section.md

@@ -238,6 +238,13 @@ The pre-existing [services.ankisyncd](#opt-services.ankisyncd.enable) has been m
 
 - `unrar` was updated to v7. See [changelog](https://www.rarlab.com/unrar7notes.htm) for more information.
 
+- `zx` was updated to v8, which introduces several breaking changes, namely:
+  `$.verbose` now defaults to `false` (but errors are still printed to `stderr`);
+  `ssh` API was dropped in favor of using the [webpod](https://github.com/webpod/webpod) package;
+  `powershell` is not automatically setup on Windows by default anymore;
+  process `cwd` synchronization between `$` invocations is now disabled by default.
+  See the [v8 changelog](https://github.com/google/zx/releases/tag/8.0.0) for more information and how to override some of these behavior changes.
+
 - `git-town` was updated from version 11 to 13. See the [changelog](https://github.com/git-town/git-town/blob/main/CHANGELOG.md#1300-2024-03-22) for breaking changes.
 
 - `k9s` was updated to v0.31. There have been various breaking changes in the config file format,