Update api-management-howto-app-insights.md

Fixes https://github.com/MicrosoftDocs/azure-docs/issues/100420

Author: dlepow

articles/api-management/api-management-howto-app-insights.md

@@ -44,12 +44,15 @@ To use Application Insights, [create an instance of the Application Insights ser
     * This setting regularly validates whether the API Management gateway endpoint is responding. 
     * Results appear in the **Availability** pane of the Application Insights instance.
 1. Select **Create**.
-1. Check that the new Application Insights logger with an instrumentation key now appears in the list.  
+1. Check that the new Application Insights logger now appears in the list.  
     :::image type="content" source="media/api-management-howto-app-insights/apim-app-insights-logger-2.png" alt-text="Screenshot that shows where to view the newly created Application Insights logger with instrumentation key":::
 
 > [!NOTE]
 > Behind the scenes, a [Logger](/rest/api/apimanagement/current-ga/logger/create-or-update) entity is created in your API Management instance, containing the instrumentation key of the Application Insights instance.
 
+> [!TIP]
+> If you need to update the instrumentation key of the Application Insights instance, select the logger's row in the list (not the name of the logger). Enter the instrumentaiton key, and select **Save**.
+
 ## Enable Application Insights logging for your API
 
 1. Navigate to your **Azure API Management service instance** in the **Azure portal**.