add note for linux vm

Author: genlin

articles/app-service/faq-configuration-and-management.md

@@ -67,7 +67,7 @@ To set the server time zone for your web app:
     * Value = *The time zone you want*
 3. Select **Save**.
 
-See the **Timezone** column in the [Default Time Zones](https://docs.microsoft.com/windows-hardware/manufacture/desktop/default-time-zones) article for accepted values.
+For the App services that run on Windows, see the **Timezone** column in the [Default Time Zones](https://docs.microsoft.com/windows-hardware/manufacture/desktop/default-time-zones) article for accepted values. For the App services that run on Linux, set the [TZ database name](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones) as the time zone value. Here is an example of TZ database name: America/Adak.
 
 ## Why do my continuous WebJobs sometimes fail?