example config: update link to E2BE docs

Closes #193

mautrix_signal/example-config.yaml

@@ -162,7 +162,7 @@ bridge:
     # If false, created portal rooms will never be federated.
     federate_rooms: true
     # End-to-bridge encryption support options. You must install the e2be optional dependency for
-    # this to work. See https://github.com/tulir/mautrix-telegram/wiki/End‐to‐bridge-encryption
+    # this to work. See https://docs.mau.fi/bridges/general/end-to-bridge-encryption.html
     encryption:
         # Allow encryption, work in group chat rooms with e2ee enabled
         allow: false