Add links to AppStream resources

Package_Management/Graphical_Tools/index.rst

@@ -81,7 +81,7 @@ On the **All** page, you can find a search button at the left edge of the header
 
    The search bar is shown when the search button is pressed when the **All** page is shown.
 
-Enter the search terms for the application you are looking for. The page will update to show appropriate matches as you enter text.
+Enter the search terms for the application you are looking for. The page will update to show appropriate matches as you enter text, finding applications based on their `AppStream`_ data (see the :ref:`Treasure example <examples_Treasure_data_dir>` for more information about this).
 
 .. figure:: images/gnome-software-search-results.png
    :align: center
@@ -188,3 +188,5 @@ Packages can be downloaded from a variety of sources. To configure these, open t
    The application menu contains an option to configure the software repositories.
 
 Select the **Software Repositories** item to launch a separate tool for adding, removing and configuring the remote repositories containing software that can be downloaded.
+
+.. include:: /links.txt