Mention Element X Android not being quite ready for testing yet

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 Thanks to [Benjamin Kampmann](https://github.com/gnunicorn) for [getting it started](https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2515), [FSG-Cat](https://github.com/FSG-Cat) for fixing it up and me ([Slavi](https://github.com/spantaleev)) for polishing it up, the playbook can now install and configure the [sliding-sync proxy](https://github.com/matrix-org/sliding-sync).
 
-The new Element X clients ([Element X iOS](https://github.com/vector-im/element-x-ios) and [Element X Android](https://github.com/vector-im/element-x-android)) require the `sliding-sync` proxy to do their job. These clients are still in beta, and now playbook users can easily give them a try and help test them thanks to us having `sliding-sync` support.
+The upcoming Element X clients ([Element X iOS](https://github.com/vector-im/element-x-ios) and [Element X Android](https://github.com/vector-im/element-x-android)) require the `sliding-sync` proxy to do their job. **These clients are still in beta** (especially Element X Android, which requires manual compilation to get it working with a non-`matrix.org` homeseserver). Playbook users can now easily give these clients a try and help test them thanks to us having `sliding-sync` support.
 
 To get started, see our [Setting up Sliding Sync Proxy](docs/configuring-playbook-sliding-sync-proxy.md) documentation page.
 

docs/configuring-playbook-sliding-sync-proxy.md

@@ -2,9 +2,13 @@
 
 The playbook can install and configure [sliding-sync](https://github.com/matrix-org/sliding-sync) proxy for you.
 
-Sliding Sync is an implementation of [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/blob/kegan/sync-v3/proposals/3575-sync.md) and a prerequisite for running the new (still beta) Element X clients ([Element X iOS](https://github.com/vector-im/element-x-ios) and [Element X Android](https://github.com/vector-im/element-x-android)).
+Sliding Sync is an implementation of [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/blob/kegan/sync-v3/proposals/3575-sync.md) and a prerequisite for running the new (**still beta**) Element X clients ([Element X iOS](https://github.com/vector-im/element-x-ios) and [Element X Android](https://github.com/vector-im/element-x-android)).
 
-See the project's [documentation](https://github.com/matrix-org/sliding-syncb) to learn more.
+See the project's [documentation](https://github.com/matrix-org/sliding-sync) to learn more.
+
+Element X iOS is [available on TestFlight](https://testflight.apple.com/join/uZbeZCOi).
+
+Element X Android requires manual compilation to get it working with a non-`matrix.org` homeseserver. It's also less feature-complete than the iOS version.
 
 **NOTE**: The Sliding Sync proxy **only works with the Traefik reverse-proxy**. If you have an old server installation (from the time `matrix-nginx-proxy` was our default reverse-proxy - `matrix_playbook_reverse_proxy_type: playbook-managed-nginx`), you won't be able to use Sliding Sync.