xml docs

Author: nvborisenko

dotnet/src/webdriver/Internal/PortUtilities.cs

@@ -32,6 +32,9 @@ public static class PortUtilities
     /// Finds a random, free port to be listened on.
     /// </summary>
     /// <returns>A random, free port to be listened on.</returns>
+    /// <exception cref="InvalidOperationException">
+    /// Thrown when a free port cannot be found due to socket binding issues.
+    /// </exception>
     public static int FindFreePort()
     {
         using var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);