Create _err_ngrok_6024.md

adding additional information for 6024 to match interstitial page.

docs/errors/details/_err_ngrok_6024.md

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+### Additional Information
+
+## Are you the developer?
+
+We display this page to prevent abuse. Visitors to your site will only see it once. 
+If you are attempting to access an endpoint programmatically and are still encountering this error, the interstitial page can be bypassed.
+
+## To remove this page:
+
+- Set and send an ngrok-skip-browser-warning request header with any value.
+- Or, set and send a custom/non-standard browser User-Agent request header.
+- Or, please [upgrade](https://dashboard.ngrok.com/billing) to any paid ngrok account.
+
+For more information and examples, please see the interstitial explanation [here](https://ngrok.com/docs/guides/limits/#why-is-there-an-interstitial-in-front-of-my-html-content).
+
+If you are the Administrator for this account, and none of these steps work for you or you have additional questions, drop us a note at at [[email protected]](mailto:[email protected]?subject=Help%20with%20ngrok%203200%20error).