removed submitted notes at the top of the files

Author: henrikac

contents/tree_traversal/code/csharp/Program.cs

@@ -1,4 +1,3 @@
-// submitted by Julian Schacher (jspp)
 using System;
 
 namespace TreeTraversal

contents/tree_traversal/code/csharp/Tree.cs

@@ -1,4 +1,3 @@
-// submitted by Julian Schacher (jspp)
 using System;
 using System.Collections.Generic;