Adapt to the renamed events-broker.jar build artifact

With Ie7eb4be2f5a6314f6a0691047a8d1c5883a4b0c0 the build result of the
events-broker was renamed from libevents-broker.jar to
events-broker.jar.

Change-Id: Ia841665c2cd86a59e6015065cbe1e73aff4c5447

example-setup/broker/README.md

diff --git a/example-setup/broker/README.md b/example-setup/broker/README.md
index d50e097..76ce6dd 100644
--- a/example-setup/broker/README.md
+++ b/example-setup/broker/README.md
@@ -10,7 +10,7 @@
 ```bash
 cp $GERRIT_HOME/bazel-bin/plugins/pull-replication/pull-replication.jar .
 cp $GERRIT_HOME/bazel-bin/plugins/events-kafka/events-kafka.jar .
-cp $GERRIT_HOME/bazel-bin/plugins/events-broker/libevents-broker.jar .
+cp $GERRIT_HOME/bazel-bin/plugins/events-broker/events-broker.jar .
 ```
 
 Start up the application using docker compose: