[docs] Custom destinations in static embedding (#42080)

* custom destinations in static embedding

* Update docs/embedding/static-embedding.md

Co-authored-by: Jeff Bruemmer <jeff.bruemmer@gmail.com>

---------

Co-authored-by: Jeff Bruemmer <jeff.bruemmer@gmail.com>

docs/embedding/static-embedding.md

 ---
 title: Static embedding
 redirect_from:
-- /docs/latest/embedding/signed-embedding
+  - /docs/latest/embedding/signed-embedding
 ---
 
 # Static embedding
@@ -67,7 +67,7 @@ Once you've made a question or dashboard [embeddable](#making-a-question-or-dash
 2. Make any changes and copy the code.
 3. [Preview the code](#previewing-the-code-for-an-embed)
 4. Add the code to the server code that builds your website.
-6. Add the frontend code to the code that generates the page where you want the embedded item to appear.
+5. Add the frontend code to the code that generates the page where you want the embedded item to appear.
 
 For more examples, see our [reference apps repo](https://github.com/metabase/embedding-reference-apps).
 
@@ -140,8 +140,8 @@ To refresh the results of a dashboard at a specific cadence, you can parameteriz
 For example, the following code for generating an iframe URL for a dashboard would display the dashboard's title and refresh its results every 60 seconds.
 
 ```js
-var iframeUrl = METABASE_SITE_URL + "/embed/dashboard/" + token +
-  "#titled=true&refresh=60";
+var iframeUrl =
+  METABASE_SITE_URL + "/embed/dashboard/" + token + "#titled=true&refresh=60";
 ```
 
 For the full list options you can parameterize, see [customizing the appearance of a static embed](./static-embedding-parameters.md#customizing-the-appearance-of-a-static-embed).
@@ -171,6 +171,10 @@ Dashboards are a fixed aspect ratio, so if you'd like to ensure they're automati
 <iframe src="http://metabase.example.com/embed/dashboard/TOKEN" onload="iFrameResize({}, this)"></iframe>
 ```
 
+## Custom destinations on dashboards in static embeds
+
+You can only use the **URL** option for [custom destinations](..//dashboards/interactive.md#custom-destinations) on dashboards with static embedding. External URLs will open in a new tab or window.
+
 ## Further reading
 
 - [Parameters for static embeds](./static-embedding-parameters.md).