Fix comment typo in DragDrop.cs (#4148)

src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/DragDrop.cs

@@ -699,7 +699,7 @@ int UnsafeNativeMethods.IOleDropSource.OleGiveFeedback(int effect)
         }
 
         /// <summary>
-        /// Raise QueryContinueDrag event for Tunel and Bubble.
+        /// Raise QueryContinueDrag event for Tunnel and Bubble.
         /// </summary>
         private void RaiseQueryContinueDragEvent(QueryContinueDragEventArgs args)
         {
@@ -822,9 +822,9 @@ private void RaiseGiveFeedbackEvent(GiveFeedbackEventArgs args)
         ///     Hence if any two mouse buttons are pressed at any point of time,
         ///     then we cancel the drapdrop. Also if no mouse buttons are pressed at
         ///     any point of time, then we complete the drop. If an application intends
-        ///     to privide multi-button press dragging (like dragging by pressing 
+        ///     to provide multi-button press dragging (like dragging by pressing 
         ///     both left and right buttons of mouse) applications will have
-        ///     to handle (Preview)QueryContiueDragEvent to the allow 
+        ///     to handle (Preview)QueryContinueDragEvent to the allow 
         ///     such valid combinations explicitly.
         /// </remarks>
         private void OnDefaultQueryContinueDrag(QueryContinueDragEventArgs e)
@@ -947,7 +947,7 @@ int UnsafeNativeMethods.IOleDropTarget.OleDragEnter(object data, int dragDropKey
 
             if (target != null)
             {
-                // Create DragEvent agrument and then raise DragEnter event for Tunnel or Buuble event.
+                // Create DragEvent argument and then raise DragEnter event for Tunnel or Bubble event.
                 RaiseDragEvent(
                     DragDrop.DragEnterEvent,
                     dragDropKeyStates,
@@ -1130,7 +1130,7 @@ int UnsafeNativeMethods.IOleDropTarget.OleDrop(object data, int dragDropKeyState
         #region Private Methods
 
         /// <summary>
-        /// Raise Drag(Enter/Over/Leave/Drop) events to the taret.
+        /// Raise Drag(Enter/Over/Leave/Drop) events to the target.
         /// </summary>
         private void RaiseDragEvent(RoutedEvent dragEvent, int dragDropKeyStates, ref int effects, DependencyObject target, Point targetPoint)
         {
@@ -1139,7 +1139,7 @@ private void RaiseDragEvent(RoutedEvent dragEvent, int dragDropKeyStates, ref in
             Invariant.Assert(_dataObject != null);
             Invariant.Assert(target != null);
 
-            // Create DragEvent argement to raise DragEnter events to the target.
+            // Create DragEvent argument to raise DragEnter events to the target.
             dragEventArgs = new DragEventArgs(
                 _dataObject,
                 (DragDropKeyStates)dragDropKeyStates,