Update docs/developing/setup-gh-app-locally.md

Co-authored-by: Nicolas Frati <nicofrati@gmail.com>

docs/developing/setup-gh-app-locally.md

@@ -7,5 +7,5 @@
 Forwarding http://a7af-103-98-78-24.ngrok.io -> http://localhost:8080
 ```
 4. Open the GitHub app settings by going to https://github.com/settings/apps and select the app you created in step 1 by clicking the `Edit` button.
-5. Go to the `Webhook` section and update the `Webhook URL` to `<generated ngrok domain in step 3>/api/integrations/github-app/webhook`. So in the case of the above example, it will be `http://a7af-103-98-78-24.ngrok.io//api/integrations/github-app/webhook`
+5. Go to the `Webhook` section and update the `Webhook URL` to `<generated ngrok domain in step 3>/api/integrations/github-app/webhook`. So in the case of the above example, it will be `http://a7af-103-98-78-24.ngrok.io/api/integrations/github-app/webhook`
 6. Open your local Porter instance by going to `http://localhost:8081` and you should now be able to now install your own GitHub app!