Add some comments explaining what these files do. rs=jst

git-svn-id: svn://10.0.0.236/trunk@193256 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/content/base/src/nsCommentNode.cpp

@@ -34,6 +34,11 @@
  * the terms of any one of the MPL, the GPL or the LGPL.
  *
  * ***** END LICENSE BLOCK ***** */
+
+/*
+ * Implementations of DOM Core's Comment node.
+ */
+
 #include "nsIDOMComment.h"
 #include "nsGenericDOMDataNode.h"
 #include "nsLayoutAtoms.h"