Add xmldoc to interfaces

osu.Game/Rulesets/Edit/Checks/Components/ICheck.cs

@@ -6,6 +6,9 @@
 
 namespace osu.Game.Rulesets.Edit.Checks.Components
 {
+    /// <summary>
+    /// A specific check that can be run on a beatmap to verify or find issues.
+    /// </summary>
     public interface ICheck
     {
         /// <summary>

osu.Game/Rulesets/Edit/IBeatmapVerifier.cs

@@ -7,6 +7,9 @@
 
 namespace osu.Game.Rulesets.Edit
 {
+    /// <summary>
+    /// A class which can run against a beatmap and surface issues to the user which could go against known criteria or hinder gameplay.
+    /// </summary>
     public interface IBeatmapVerifier
     {
         public IEnumerable<Issue> Run(IBeatmap beatmap);