Added some comments for the token classes.

ICSharpCode.NRefactory.CSharp/Ast/CSharpTokenNode.cs

@@ -27,6 +27,12 @@ using System;
 
 namespace ICSharpCode.NRefactory.CSharp
 {
+	/// <summary>
+	/// Represents a token in C#. Note that the type of the token is defined through the TokenRole.
+	/// </summary>
+	/// <remarks>
+	/// In all non null c# token nodes the Role of a CSharpToken must be a TokenRole.
+	/// </remarks>
 	public class CSharpTokenNode : AstNode, IRelocatable
 	{
 		public static new readonly CSharpTokenNode Null = new NullCSharpTokenNode ();

ICSharpCode.NRefactory.CSharp/Ast/TokenRole.cs

@@ -2,13 +2,22 @@ using System;
 
 namespace ICSharpCode.NRefactory.CSharp
 {
+	/// <summary>
+	/// A specific role only used for C# tokens
+	/// </summary>
 	public sealed class TokenRole : Role<CSharpTokenNode>
 	{
+		/// <summary>
+		/// Gets the token as string. Note that the token Name and Token value may differ.
+		/// </summary>
 		public string Token {
 			get;
 			private set;
 		}
 		
+		/// <summary>
+		/// Gets the char length of the token.
+		/// </summary>
 		public int Length {
 			get;
 			private set;