image changes for monitoring

Signed-off-by: Hiranmoy Das Chowdhury <[email protected]>

docs/guides/pgbouncer/monitoring/using-builtin-prometheus.md

@@ -337,10 +337,9 @@ Forwarding from [::1]:9090 -> 9090
 Now, we can access the dashboard at `localhost:9090`. Open [http://localhost:9090](http://localhost:9090) in your browser. You should see the endpoint of `builtin-prom-pb-stats` service as one of the targets.
 
 <p align="center">
-  <img alt="Prometheus Target" height="100%" src="/docs/images/pgbouncer/monitoring/pb-builtin-prom-target.png" style="padding:10px">
+  <img alt="Prometheus Target" src="/docs/images/pgbouncer/monitoring/pb-builtin-prom-target.png" style="padding:10px">
 </p>
 
-
 Check the labels marked with red rectangle. These labels confirm that the metrics are coming from `PgBouncer` database `builtin-prom-pb` through stats service `builtin-prom-pb-stats`.
 
 Now, you can view the collected metrics and create a graph from homepage of this Prometheus dashboard. You can also use this Prometheus server as data source for [Grafana](https://grafana.com/) and create beautiful dashboard with collected metrics.