Fix typo in comment

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@6282 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Document/UndoStack.cs

@@ -371,7 +371,7 @@ namespace ICSharpCode.AvalonEdit.Document
 			if (redostack.Count != 0) {
 				redostack.Clear();
 				NotifyPropertyChanged("CanRedo");
-				// if the "orginal file" marker is on the redo stack: remove it
+				// if the "original file" marker is on the redo stack: remove it
 				if (elementsOnUndoUntilOriginalFile < 0)
 					elementsOnUndoUntilOriginalFile = int.MinValue;
 			}