Fix Sample App Search

Wasn't lowering the query so wasn't doing case-insensitive as desired
Also add searching descriptions of samples

Author: michael-hawker

CommunityToolkit.App.Shared/Pages/Shell.xaml.cs

@@ -162,8 +162,8 @@ private void searchBox_TextChanged(AutoSuggestBox sender, AutoSuggestBoxTextChan
             }
             else
             {
-                var query = searchBox.Text;
-                searchBox.ItemsSource = samplePages?.Where(s => s!.Title!.ToLower().Contains(query) || s!.Keywords!.ToLower().Contains(query) || s!.Category!.ToString().ToLower().Contains(query) || s!.Subcategory!.ToString().ToLower().Contains(query)).ToArray(); ;
+                var query = searchBox.Text.ToLower();
+                searchBox.ItemsSource = samplePages?.Where(s => s!.Title!.ToLower().Contains(query) || s!.Description!.ToLower().Contains(query) || s!.Keywords!.ToLower().Contains(query) || s!.Category!.ToString().ToLower().Contains(query) || s!.Subcategory!.ToString().ToLower().Contains(query)).ToArray();
                 return;
             }
         }