Add Create annotations in panel video to the documentation (#86383)

* Add Create annotations in panel video to the documentation

* Update docs/sources/dashboards/build-dashboards/annotate-visualizations/index.md

Co-authored-by: Isabel Matwawana <76437239+imatwawana@users.noreply.github.com>

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Co-authored-by: Isabel Matwawana <76437239+imatwawana@users.noreply.github.com>
Co-authored-by: Isabel Matwawana <isabel.matwawana@grafana.com>

docs/sources/dashboards/build-dashboards/annotate-visualizations/index.md

@@ -51,6 +51,10 @@ To add annotations directly in the panel:
 - The dashboard must already be saved.
 - The built-in query must be enabled. Learn more in [Built-in query](#built-in-query).
 
+Watch the following video for a quick tutorial on creating annotations:
+
+{{< youtube id="N5iOlyYyK6Q" >}}
+
 ### Add an annotation
 
 To add an annotation, complete the following steps: