Update configuring-playbook-bridge-mautrix-whatsapp.md

Backfilling is now supported. Updating documentation.

docs/configuring-playbook-bridge-mautrix-whatsapp.md

@@ -24,23 +24,6 @@ matrix_mautrix_whatsapp_bridge_relay_admin_only: false
 If you want to activate the relay bot in a room, use `!wa set-relay`.
 Use `!wa unset-relay` to deactivate.
 
-## Enable backfilling history
-This requires a server with MSC2716 support, which is currently an experimental feature in synapse.
-Note that as of Synapse 1.46, there are still some bugs with the implementation, especially if using event persistence workers.
-Use the following playbook configuration:
-
-```yaml
-matrix_synapse_configuration_extension_yaml: |
-  experimental_features:
-    msc2716_enabled: true
-```
-```yaml
-matrix_mautrix_whatsapp_configuration_extension_yaml:
-  bridge:
-    history_sync:
-      backfill: true
-```
-
 ## Set up Double Puppeting
 
 If you'd like to use [Double Puppeting](https://docs.mau.fi/bridges/general/double-puppeting.html) (hint: you most likely do), you have 2 ways of going about it.