Adding helm repo update (#3010)

Signed-off-by: salaboy <[email protected]>

Signed-off-by: salaboy <[email protected]>

Author: salaboy

daprdocs/content/en/operations/monitoring/metrics/grafana.md

@@ -42,6 +42,7 @@ The `grafana-actor-dashboard.json` template shows Dapr Sidecar status, actor inv
 
    ```bash
    helm repo add grafana https://grafana.github.io/helm-charts
+   helm repo update
    ```
 
 1. Install the chart:
@@ -176,4 +177,4 @@ First you need to connect Prometheus as a data source to Grafana.
 
 <div class="embed-responsive embed-responsive-16by9">
 <iframe width="560" height="315" src="https://www.youtube.com/embed/8W-iBDNvCUM?start=2577" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
-</div>
+</div>