Minor API docs improvements (dotnet#34091)

Fixes the last 2 docs build system warnings

Author: jfversluis

src/Controls/src/Core/DragAndDrop/DataPackageView.cs

@@ -4,7 +4,7 @@
 namespace Microsoft.Maui.Controls
 {
 	/// <summary>
-	/// A read-only view of a <see cref="DataPackage"/>.
+	/// A read-only view of a <see cref="Controls.DataPackage"/>.
 	/// </summary>
 	public class DataPackageView
 	{

src/Controls/src/Core/Shell/ShellSection.cs

@@ -22,7 +22,7 @@ public class Tab : ShellSection
 	}
 
 	/// <summary>
-	/// Represents a group of tabs within a <see cref="ShellItem"/>. Contains <see cref="ShellContent"/> items.
+	/// Represents a group of tabs within a <see cref="Controls.ShellItem"/>. Contains <see cref="ShellContent"/> items.
 	/// </summary>
 	[ContentProperty(nameof(Items))]
 	[EditorBrowsable(EditorBrowsableState.Never)]