[docs][producer] Update deliverAfter and deliverAt api comment (#1339)

Author: geniusjoe

pulsar/message.go

@@ -56,14 +56,14 @@ type ProducerMessage struct {
 
 	// DeliverAfter requests to deliver the message only after the specified relative delay.
 	// Note: messages are only delivered with delay when a consumer is consuming
-	//     through a `SubscriptionType=Shared` subscription. With other subscription
-	//     types, the messages will still be delivered immediately.
+	//     through a `SubscriptionType=Shared` or `SubscriptionType=KeyShared` subscription.
+	//     With other subscription types, the messages will still be delivered immediately.
 	DeliverAfter time.Duration
 
 	// DeliverAt delivers the message only at or after the specified absolute timestamp.
 	// Note: messages are only delivered with delay when a consumer is consuming
-	//     through a `SubscriptionType=Shared` subscription. With other subscription
-	//     types, the messages will still be delivered immediately.
+	//     through a `SubscriptionType=Shared` or `SubscriptionType=KeyShared` subscription.
+	//     With other subscription types, the messages will still be delivered immediately.
 	DeliverAt time.Time
 
 	//Schema assign to the current message