Adding instructions for increasing EB Timeout (#25895)

* Adding instructions for increasing EB Timeout

If you host your metabase application on Elastic Beanstalk and a query takes longer than 60 seconds, you will get a "Your query took too long" error.  This section documents how to increase that timeout value.

* Updating readme based on PR feedback.

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

docs/installation-and-operation/running-metabase-on-elastic-beanstalk.md

@@ -188,6 +188,16 @@ In the Environment Properties section, you'll be able to set or change the varia
 
 ![EB Environment Variables](images/EBEnvVariables.png)
 
+## Increase the query timeout
+
+AWS Elastic Load Balancer has a default timeout of 60 seconds, while Metabase ships with a timeout of 10 minutes for the nginx configuration.  If a query takes longer than 60 seconds, a user will see a "Your question took too long" error message.  Follow these steps to increase the ELB timeout for your Elastic Beanstalk Metabase application: 
+
+1. In AWS, go to the "EC2" page and click on "Load Balancers" in the side navigation.
+2. Select the load balancer for your metabase application.  If you have multiple load balancers, finding the correct one might be based on your setup, but yours might have a "Tag" of "elasticbeanstalk:environment-name" which equals "Metabase-env".
+3. In the "Attributes" section for the metabase loadbalancer, notice how the "Idle Timeout" is set to "60 seconds".
+4. Click "Edit Attributes" and set the "Idle Timeout" to the desired value.  Example: `600` will give you a timeout of 10 minutes.
+5. Click Save.
+
 ## Notifications
 
 For a simple way to keep tabs on your application, enter an email address in the **Notifications** block to get notifications about your deployment and any changes to your application.