Update docs/configuring-playbook-etherpad.md: edit the introduction

Based on docs/configuring-playbook-jitsi.md

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-etherpad.md

@@ -1,6 +1,8 @@
 # Setting up Etherpad (optional)
 
-[Etherpad](https://etherpad.org) is an open source collaborative text editor that can be embedded in a Matrix chat room using the [Dimension integration manager](https://dimension.t2bot.io) or used as standalone web app.
+The playbook can install and configure [Etherpad](https://etherpad.org) for you.
+
+Etherpad is an open source collaborative text editor. It can not only be integrated with Element clients ([Element Web](configuring-playbook-client-element-web.md)/Desktop, Android and iOS) as a widget, but also be used as standalone web app.
 
 When enabled together with the Jitsi audio/video conferencing system (see [our docs on Jitsi](configuring-playbook-jitsi.md)), it will be made available as an option during the conferences.