Fix Grafana dashboard URL (#2034)

Signed-off-by: Jeremy Richards <jrichards@trumidtech.com>

zookeeper-docs/src/main/resources/markdown/zookeeperMonitor.md

@@ -204,7 +204,7 @@ All the metrics are included in the `ServerMetrics.java`.
     Url:    http://localhost:9090
     Access: proxy
     ```
-- Then download and import the default ZooKeeper dashboard [template](https://grafana.com/dashboards/10465) and customize.
+- Then download and import the default ZooKeeper dashboard [template](https://grafana.com/grafana/dashboards/10465) and customize.
 - Users can ask for Grafana dashboard account if having any good improvements by writing a email to **dev@zookeeper.apache.org**.
 
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