Minor XML docs improvements

Author: Sergio0694

CommunityToolkit.WinUI/Extensions/Interop/DispatcherQueueProxyHandler1.cs

@@ -85,12 +85,20 @@ internal unsafe struct DispatcherQueueProxyHandler1
             return (IDispatcherQueueHandler*)@this;
         }
 
+        /// <summary>
+        /// Devirtualized API for <c>IUnknown.AddRef()</c>.
+        /// </summary>
+        /// <returns>The updated reference count for the current instance.</returns>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public uint AddRef()
         {
             return Interlocked.Increment(ref referenceCount);
         }
 
+        /// <summary>
+        /// Devirtualized API for <c>IUnknown.Release()</c>.
+        /// </summary>
+        /// <returns>The updated reference count for the current instance.</returns>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public uint Release()
         {

CommunityToolkit.WinUI/Extensions/Interop/DispatcherQueueProxyHandler2.cs

@@ -92,12 +92,20 @@ internal unsafe struct DispatcherQueueProxyHandler2
             return (IDispatcherQueueHandler*)@this;
         }
 
+        /// <summary>
+        /// Devirtualized API for <c>IUnknown.AddRef()</c>.
+        /// </summary>
+        /// <returns>The updated reference count for the current instance.</returns>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public uint AddRef()
         {
             return Interlocked.Increment(ref referenceCount);
         }
 
+        /// <summary>
+        /// Devirtualized API for <c>IUnknown.Release()</c>.
+        /// </summary>
+        /// <returns>The updated reference count for the current instance.</returns>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public uint Release()
         {

CommunityToolkit.WinUI/Extensions/Interop/IDispatcherQueue.cs

@@ -14,6 +14,9 @@ namespace CommunityToolkit.WinUI.Interop
     /// </summary>
     internal unsafe struct IDispatcherQueue
     {
+        /// <summary>
+        /// The vtable pointer for the current instance.
+        /// </summary>
         private readonly void** lpVtbl;
 
         /// <summary>

CommunityToolkit.WinUI/Extensions/Interop/IDispatcherQueueHandler.cs

@@ -13,6 +13,9 @@ namespace CommunityToolkit.WinUI.Interop
     /// </summary>
     internal unsafe struct IDispatcherQueueHandler
     {
+        /// <summary>
+        /// The vtable pointer for the current instance.
+        /// </summary>
         private readonly void** lpVtbl;
 
         /// <summary>