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Doc Comment Observable Releases Client

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Code Analysis fixes

Octokit/Models/Request/ReleaseAssetUpdate.cs

@@ -7,7 +7,23 @@ namespace Octokit
 {
     public class ReleaseAssetUpdate
     {
-        public string Name { get; set; }
+        public ReleaseAssetUpdate(string name)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(name, "name");
+
+            Name = name;
+        }
+
+        /// <summary>
+        /// The file name of the asset.
+        /// This field is required.
+        /// </summary>
+        public string Name { get; private set; }
+        
+        /// <summary>
+        /// An alternate description of the asset.
+        /// Used in place of the filename.
+        /// </summary>
         public string Label { get; set; }
     }
 }