fix shortcode usage (#71353)

docs/sources/developers/plugins/migration-guide/v6.x-v7.x/_index.md

@@ -37,7 +37,8 @@ With Grafana 7.0, we released a new tool for making it easier to develop plugins
 
 For more information, refer to [@grafana/toolkit](https://www.npmjs.com/package/@grafana/toolkit).
 
-{{% admonition type="note" %}} As of Grafana 10.0, `@grafana/toolkit` is deprecated. It is replaced by the [`create-plugin`](https://grafana.github.io/plugin-tools/docs/creating-a-plugin) tool. %}}
+{{% admonition type="note" %}} As of Grafana 10.0, `@grafana/toolkit` is deprecated. It is replaced by the [`create-plugin`](https://grafana.github.io/plugin-tools/docs/creating-a-plugin) tool.
+{{% /admonition %}}
 
 ### Field options