Update docs for Draupnir and Mjolnir: add the "optional" label to E2EE support sections

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

docs/configuring-playbook-bot-draupnir.md

@@ -20,7 +20,7 @@ Once you have created the room you need to copy the room ID so you can specify i
 
 After running the installation command, you'll need to invite the bot to the management room. See the [Usage](#usage) section for details about it.
 
-## End-to-End Encryption support
+## Enable End-to-End Encryption support (optional)
 
 Decide whether you want to support having an encrypted management room or not. Draupnir can still protect encrypted rooms without encryption support enabled.
 

docs/configuring-playbook-bot-mjolnir.md

@@ -92,7 +92,7 @@ matrix_bot_mjolnir_enabled: true
 matrix_bot_mjolnir_management_room: "MANAGEMENT_ROOM_ID_HERE"
 ```
 
-### End-to-End Encryption support
+### Enable End-to-End Encryption support (optional)
 
 Decide whether you want Mjolnir to be capable of operating in end-to-end encrypted (E2EE) rooms. This includes the management room and the moderated rooms.