Add XML docs required by CommentChecker fixes

tests/ZB.MOM.WW.CDBBC.E2E.Benchmark.Tests/E2EThroughputBenchmarks.cs

@@ -15,6 +15,9 @@ public class E2EThroughputBenchmarks
     private BenchmarkPeerNode _nodeB = null!;
     private int _sequence;
 
+    /// <summary>
+    ///     Sets up benchmark nodes and prepares the cluster.
+    /// </summary>
     [GlobalSetup]
     public async Task GlobalSetupAsync()
     {
@@ -58,6 +61,9 @@ public class E2EThroughputBenchmarks
         await Task.Delay(500);
     }
 
+    /// <summary>
+    ///     Handles benchmark teardown for the throughput test suite.
+    /// </summary>
     [GlobalCleanup]
     public Task GlobalCleanupAsync()
     {
@@ -66,6 +72,9 @@ public class E2EThroughputBenchmarks
         return Task.CompletedTask;
     }
 
+    /// <summary>
+    ///     Measures local write throughput against a single node.
+    /// </summary>
     [Benchmark(Description = "Local write throughput", OperationsPerInvoke = BatchSize)]
     public async Task LocalWriteThroughput()
     {
@@ -74,6 +83,9 @@ public class E2EThroughputBenchmarks
             await _nodeA.UpsertUserAsync(CreateUser(userId));
     }
 
+    /// <summary>
+    ///     Measures replicated write throughput across two nodes.
+    /// </summary>
     [Benchmark(Description = "Cross-node replicated throughput", OperationsPerInvoke = BatchSize)]
     public async Task ReplicatedWriteThroughput()
     {