PD-1375 Updates to Main Apps Index.md

this commit makes changes to the the /truenas_apps/_index.md file.

It corrects information and mentions of the ix-apps dataset, when it gets created, and when the old ix-applications dataset exists in 24.10.

It adds comments about the change from kubernetes backend to docker compose and links to the 24.10 release notes.

content/TruenasApps/_index.md

@@ -25,6 +25,9 @@ keywords:
 
 
 TrueNAS applications allow for quick and easy integration of third-party software and TrueNAS.
+The TrueNAS applications backend changed in 24.10 to Docker images managed with Docker Compose.
+Earlier TrueNAS releases operated with Kubernetes K3 and Helm providing containers for applications.
+For more information on this change refer to the [24.10 Release Note]({{< relref "/Content/SCALE/GettingStarted/ScaleReleaseNotes.md" >}}).
 
 {{< include file="/static/includes/ProposeArticleChange.md" >}}
 
@@ -85,9 +88,6 @@ Select the pool and click **Save**. If you close the dialog to set the pool late
 
 {{< trueimage src="/images/SCALE/Apps/AppsSettingsChoosePool.png" alt="Choosing a Pool for Apps" id="Choosing a Pool for Apps" >}}
 
-TrueNAS creates an **ix-applications** dataset on the chosen pool and uses it to store all container-related data.
-The dataset is for internal use only.
-
 If you want to set up new datasets to store your application data in a location separate from other storage on your system, create the datasets before installing the application.
 For example, create the datasets for the Nextcloud app before installing the app.
 
@@ -224,6 +224,14 @@ The primary mount volumes have two options:
 * **ixVolume** that creates a storage volume inside the **ix-apps** dataset. This is the default setting.
 * **Host Path** that allows you to select an existing dataset created for the application. Shows additional fields to select the path to the dataset and add the mount point.
 
+{{< hint type="information" title="ix-apps Dataset" >}}
+The **ix-apps** dataset is for internal use only.
+
+TrueNAS systems with applications deployed that upgrade from earlier releases to 24.10 continue to see the **ix-Applications** dataset on the pool chosen for applications to use.
+New installs or systems upgrading where applications are not deployed and a pool is not chosen for apps use the hidden **ix-apps** dataset.
+Choosing the pool for apps to use, creates this dataset to store all container-related data.
+{{< /hint >}}
+
 If adding an additional storage volume, click **Add** to configure additional storage volumes for the application to use in addition to the main storage volume (dataset).
 The three storage options are:
 * **ixVolume**