Fix all the old usage of admonition syntax (#107098)

docs/sources/getting-started/build-first-dashboard.md

@@ -16,9 +16,9 @@ weight: 200
 
 This topic helps you get started with Grafana and build your first dashboard using the built-in `Grafana` data source. To learn more about Grafana, refer to [Introduction to Grafana](https://grafana.com/docs/grafana/<GRAFANA_VERSION>/introduction/).
 
-{{% admonition type="note" %}}
+{{< admonition type="note" >}}
 Grafana also offers a [free account with Grafana Cloud](/signup/cloud/connect-account?pg=gsdocs) to help getting started even easier and faster. You can install Grafana to self-host or get a free Grafana Cloud account.
-{{% /admonition %}}
+{{< /admonition >}}
 
 #### Install Grafana
 

docs/sources/getting-started/get-started-grafana-prometheus.md

@@ -42,9 +42,9 @@ Prometheus node_exporter is a widely used tool that exposes system metrics. For
 
 When you run node_exporter locally, navigate to `http://localhost:9100/metrics` to check that it is exporting metrics.
 
-{{% admonition type="note" %}}
+{{< admonition type="note" >}}
 The instructions in the referenced topic are intended for Linux users. You may have to alter the instructions slightly depending on your operating system. For example, if you are on Windows, use the [windows_exporter](https://github.com/prometheus-community/windows_exporter) instead.
-{{% /admonition %}}
+{{< /admonition >}}
 
 #### Install and configure Prometheus
 
@@ -108,9 +108,9 @@ remote_write:
     password: <Your Grafana.com API Key>
 ```
 
-{{% admonition type="note" %}}
+{{< admonition type="note" >}}
 To configure your Prometheus instance to work with Grafana locally instead of Grafana Cloud, install Grafana [here](/grafana/download) and follow the configuration steps listed [here](/docs/grafana/latest/datasources/prometheus/#configure-the-data-source).
-{{% /admonition %}}
+{{< /admonition >}}
 
 #### Check Prometheus metrics in Grafana Explore view