Fix Task.Delay() <exception> XML comments (#53392)

* Fix `Task.Delay()` `<exception>` XML comments

Fix `ObjectDisposedException` comments to state that the exception is
thrown when the `CancellationTokenSource` of the `CancellationToken` is
disposed, and not the `CancellationToken` itself.

* Use suggested message

Co-authored-by: Sam Harwell <sam@tunnelvisionlabs.com>

* Use suggested message

Co-authored-by: Sam Harwell <sam@tunnelvisionlabs.com>

src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs

@@ -5480,7 +5480,8 @@ public static Task<TResult> Run<TResult>(Func<Task<TResult>?> function, Cancella
         /// The <paramref name="delay"/> is less than -1 or greater than the maximum allowed timer duration.
         /// </exception>
         /// <exception cref="System.ObjectDisposedException">
-        /// The provided <paramref name="cancellationToken"/> has already been disposed.
+        /// The <see cref="CancellationTokenSource"/> associated
+        /// with <paramref name="cancellationToken"/> has already been disposed.
         /// </exception>
         /// <remarks>
         /// If the cancellation token is signaled before the specified time delay, then the Task is completed in
@@ -5513,7 +5514,8 @@ public static Task Delay(TimeSpan delay, CancellationToken cancellationToken) =>
         /// The <paramref name="millisecondsDelay"/> is less than -1.
         /// </exception>
         /// <exception cref="System.ObjectDisposedException">
-        /// The provided <paramref name="cancellationToken"/> has already been disposed.
+        /// The <see cref="CancellationTokenSource"/> associated
+        /// with <paramref name="cancellationToken"/> has already been disposed.
         /// </exception>
         /// <remarks>
         /// If the cancellation token is signaled before the specified time delay, then the Task is completed in