Document IElementHandler (#16706)

* Add Documentation for IElementHandler

* apply cr suggestions

---------

Co-authored-by: Diana Soltani <dianasoltani@microsoft.com>

src/Core/src/Handlers/IElementHandler.cs

@@ -1,21 +1,54 @@
 namespace Microsoft.Maui
 {
+	/// <summary>
+	/// Defines the core behavior necessary to create a custom element handler.
+	/// <seealso href="https://learn.microsoft.com/dotnet/maui/user-interface/handlers/"> Conceptual documentation on handlers</seealso>
+	/// </summary>
 	public interface IElementHandler
 	{
+		/// <summary>  
+		/// Sets the .NET MAUI context for the element handler.  
+		/// </summary>  
+		/// <param name="mauiContext">The .NET MAUI context to set.</param>  
 		void SetMauiContext(IMauiContext mauiContext);
-
+
+		/// <summary>  
+		/// Sets the cross-platform virtual view associated with the handler.  
+		/// </summary>  
+		/// <param name="view">The element to handle.</param>  
 		void SetVirtualView(IElement view);
 
+		/// <summary>  
+		/// Updates the value of the specified property on the handler.  
+		/// </summary>  
+		/// <param name="property">The name of the property to update.</param>  
 		void UpdateValue(string property);
 
+		/// <summary>  
+		/// Invokes the specified command on the element with the given arguments.  
+		/// </summary>  
+		/// <param name="command">The name of the command to invoke.</param>  
+		/// <param name="args">Optional arguments to pass to the command.</param>  
 		void Invoke(string command, object? args = null);
 
+		/// <summary>  
+		/// Disconnects the element handler from the element for clean up.  
+		/// </summary>  
 		void DisconnectHandler();
 
+		/// <summary>  
+		/// Gets the platform-specific view object associated with the handler.  
+		/// </summary>  
 		object? PlatformView { get; }
 
+		/// <summary>  
+		/// Gets the cross-platform virtual view associated with the handler.  
+		/// </summary>  
 		IElement? VirtualView { get; }
 
+		/// <summary>  
+		/// Gets the .NET MAUI context associated with the element.  
+		/// </summary>  
 		IMauiContext? MauiContext { get; }
 	}
 }