Describe Plex "scan_clients" button (#22478)

source/_integrations/plex.markdown

@@ -26,6 +26,7 @@ Support for playing music directly on linked [Sonos](/integrations/sonos/) speak
 There is currently support for the following device types within Home Assistant:
 
 - [Sensor](#sensor)
+- [Button](#button)
 - [Media Player](#media-player)
 
 If a Plex server has been claimed by a Plex account via the [claim interface](https://plex.tv/claim), Home Assistant will require authentication to connect.
@@ -97,6 +98,43 @@ The library sensors are disabled by default, but can be enabled via the Plex int
   
 </div>
 
+## Button
+
+A `button.scan_clients` entity is available to discover new controllable Plex clients. This may be necessary in scripts or automations which control a Plex client app, but where the underlying device must be turned on first. This button is preferred over the legacy `plex.scan_for_clients` service.
+
+Example script:
+
+{% raw %}
+
+```yaml
+play_plex_on_tv:
+  sequence:
+    - service: media_player.select_source
+      target:
+        entity_id: media_player.smart_tv
+      data:
+        source: "Plex"
+    - wait_for_trigger:
+        - platform: state
+          entity_id: media_player.smart_tv
+          to: "on"
+      timeout:
+        seconds: 10
+    - service: button.press
+      target:
+        entity_id: button.scan_clients_plex
+    - wait_template: "{{ not is_state('media_player.plex_smart_tv', 'unavailable') }}"
+      timeout: "00:00:10"
+      continue_on_timeout: false
+    - service: media_player.play_media
+      target:
+        entity_id: media_player.plex_smart_tv
+      data:
+        media_content_id: "{"library_name": "Movies", "title": "Zoolander"}"
+        media_content_type: movie
+```
+
+{% endraw %}
 
 ## Media Player
 
@@ -335,37 +373,6 @@ Refresh a Plex library to scan for new and updated media.
 | `server_name` | No | Name of Plex server to use if multiple servers configured. | "My Plex Server" |
 | `library_name` | Yes | Name of Plex library to update. | "TV Shows" |
 
-### Service `plex.scan_for_clients`
-
-Scan for new controllable Plex clients. This may be necessary in scripts or automations which control a Plex `media_player` entity, but where the underlying device must be turned on first.
-
-Example script:
-
-{% raw %}
-
-```yaml
-play_plex_on_tv:
-  sequence:
-    - service: media_player.select_source
-      target:
-        entity_id: media_player.smart_tv
-      data:
-        source: "Plex"
-    - wait_template: "{{ is_state('media_player.smart_tv', 'On') }}"
-      timeout: "00:00:10"
-    - service: plex.scan_for_clients
-    - wait_template: "{{ not is_state('media_player.plex_smart_tv', 'unavailable') }}"
-      timeout: "00:00:10"
-      continue_on_timeout: false
-    - service: media_player.play_media
-      target:
-        entity_id: media_player.plex_smart_tv
-      data:
-        media_content_id: "{"library_name": "Movies", "title": "Zoolander"}"
-        media_content_type: movie
-```
-
-{% endraw %}
 
 ## Notes