Fix typo

Change-Id: If25ae724fcac4bf9475eca506194593a7a5fdeab
Reviewed-on: https://gerrit.libreoffice.org/72628
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

dtrans/source/win32/dtobj/XTDataObject.hxx

@@ -41,7 +41,7 @@
       and decides if there is a format he can use
       if there is one, he requests the data in this format
 
-    - This class inherits from IDataObject an so can be placed on the
+    - This class inherits from IDataObject and so can be placed on the
       OleClipboard. The class wraps a transferable object which is the
       original DataSource
     - DataFlavors offered by this transferable will be translated into