docs: apps-engine-migration.md

Author: d-gubert

docs/apps-engine-migration.md

@@ -26,3 +26,4 @@ To make this migration easier to understand and review, we're using a stacked PR
 - [40183](https://github.com/RocketChat/Rocket.Chat/pull/40183) Replaces `AppPackageParser.getEngineVersion()` - which resolved the version by traversing the filesystem relative to `__dirname` - with a direct import of `ENGINE_VERSION`. This will support the migration of the `AppPackageParser` class itself.
 - [40184](https://github.com/RocketChat/Rocket.Chat/pull/40184) Copies all relevant source files from `packages/apps-engine/src/server`, `packages/apps-engine/src/client`, `packages/apps-engine/deno-runtime`, `packages/apps-engine/tests` and `packages/apps-engine/scripts` into  their corresponding path at `packages/apps`.
 - [40185](https://github.com/RocketChat/Rocket.Chat/pull/40185) Adapts the path resolution of the apps-engine package for the deno runtime
+- [40186](https://github.com/RocketChat/Rocket.Chat/pull/40186) Flips the switch; changes code in `apps/meteor` and `packages/core-services` that pointed to `@rocket.chat/apps-engine` and makes it point to `@rocket.chat/apps`. This is the turning point in what is actually executed.