added XML docs

Octokit.Reactive/Clients/ObservableIssueCommentsClient.cs

@@ -5,6 +5,12 @@ using Octokit.Reactive.Internal;
 
 namespace Octokit.Reactive
 {
+    /// <summary>
+    /// A client for GitHub's Issue Comments API.
+    /// </summary>
+    /// <remarks>
+    /// See the <a href="http://developer.github.com/v3/issues/comments/">Issue Comments API documentation</a> for more information.
+    /// </remarks>
     public class ObservableIssueCommentsClient : IObservableIssueCommentsClient
     {
         readonly IIssueCommentsClient _client;