Cleanups.

osu.Game.Rulesets.Mania/Objects/Types/IHasColumn.cs

@@ -1,11 +1,16 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-
 namespace osu.Game.Rulesets.Mania.Objects.Types
 {
+    /// <summary>
+    /// A type of hit object which lies in one of a number of predetermined columns.
+    /// </summary>
     public interface IHasColumn
     {
+        /// <summary>
+        /// The column which the hit object lies in.
+        /// </summary>
         int Column { get; }
     }
 }