Reduce sleep for sidecar example; else the additional container won't exit in time

Author: ChunyiLyu

docs/examples/sidecar/rabbitmq.yaml

@@ -12,4 +12,4 @@ spec:
             containers:
             - name: additional-container
               image: busybox
-              command: ['sh', '-c', 'echo "Hello, Kubernetes!" && sleep 5000']
+              command: ['sh', '-c', 'echo "Hello, Kubernetes!" && sleep 100']