fix: remove stale comment block that was hiding DeliveryToken and ManagementToken in Stack.cs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: reeshika-h

Contentstack.Management.Core/Models/Stack.cs

@@ -766,20 +766,8 @@ public Branch Branch(string? uid = null)
             return new Branch(this, uid);
         }
 
-        /*
-        /// <summary>
-        /// Branches allow you to isolate and easily manage your “in-progress” work from your stable work.
-        /// </summary>
-        /// <param name="uid">Optional, branch uid.</param>
-        /// <example>
-        /// <pre><code>
-        /// ContentstackClient client = new ContentstackClient("<AUTHTOKEN>", "<API_HOST>");
-        /// Stack stack = client.Stack("<API_KEY>");
-        /// ContentstackResponse response = stack.Branch().Query().Limit(2).Skip(2).Find();
-        /// </code></pre>
-        /// </example>
         /// <summary>
-        /// You can use <see cref="Models.Token.DeliveryToken" /> to authenticate Content Delivery API (CDA) requests and retrieve the published content of an environment.
+        /// You can use <see cref=”Models.Token.DeliveryToken” /> to authenticate Content Delivery API (CDA) requests and retrieve the published content of an environment.
         /// </summary>
         /// <param name="uid">Optional, delivery token uid.</param>
         /// <example>