Update XML doc on ServiceBusReceivedMessage (Azure#48023)

Author: danielmarbach

sdk/servicebus/Azure.Messaging.ServiceBus/src/Primitives/ServiceBusReceivedMessage.cs

@@ -195,7 +195,7 @@ public static ServiceBusReceivedMessage FromAmqpMessage(AmqpAnnotatedMessage mes
         public string ReplyTo => AmqpMessage.Properties.ReplyTo?.ToString();
 
         /// <summary>
-        /// Gets or sets the date and time, in UTC, at which the message should be made available to receivers. This property does not control when a message is sent by the
+        /// Gets the date and time, in UTC, at which the message should be made available to receivers. This property does not control when a message is sent by the
         /// client. Sending happens immediately when `SendAsync` is called.  Service Bus will hide the message from receivers until the the requested time.
         /// </summary>
         /// <value>