Document DisposeAsync intent.

src/libraries/Common/tests/System/Net/RemoteExecutorExtensions.cs

@@ -8,6 +8,17 @@ namespace Microsoft.DotNet.RemoteExecutor;
 
 internal static class RemoteExecutorExtensions
 {
+    /// <summary>
+    /// Dispose the RemoteInvokeHandle synchronously can take considerable time, and cause other unrelated tests to fail on timeout
+    /// because of depletion of xUnit synchronization context threads.
+    /// Running dispose in a separate task on the thread pool can help alleviate this issue.
+    /// </summary>
+    /// <example>
+    /// Executes the ServerCode in separate process and awaits its completion in a separate task outside of current synchronization context.
+    /// <code>
+    /// await RemoteExecutor.Invoke(ServerCode).DisposeAsync();
+    /// </code>
+    /// </example>
     public static async ValueTask DisposeAsync(this RemoteInvokeHandle handle)
     {
         await Task.Run(handle.Dispose);