Update dashboards.mdx (#13187)

Author: joethreepwood

contents/docs/product-analytics/dashboards.mdx

@@ -21,6 +21,8 @@ export const dashboardfiltersDark = "https://res.cloudinary.com/dmukukwp6/video/
 <iframe
     src="https://www.youtube-nocookie.com/embed/2jQco8hEvTI?start=441"
     className="rounded shadow-xl"
+    width="600"
+    height="337"
 />
 
 Dashboards are the easiest way to track all your most important product and performance metrics.