update description for subscribe method

Author: lohanidamodar

templates/flutter/lib/src/realtime.dart.twig

@@ -8,7 +8,8 @@ import 'client.dart';
 abstract class Realtime extends Service {
   factory Realtime(Client client) => createRealtime(client);
 
-  /// Channels to subscribe - pass a list of channels to subscribe
+  /// Subscribes to Appwrite events and returns a `RealtimeSubscription` object, which can be used 
+  /// to listen to events on the channels in realtime and to close the subscription to stop listening.
   /// 
   /// Possible channels are:
   /// - account
@@ -26,9 +27,6 @@ abstract class Realtime extends Service {
   /// - teams.[ID]
   /// - memberships
   /// - memberships.[ID]
-  /// 
-  /// Returns a `RealtimeSubscription` object, which can be used to listen to events on the channels
-  /// and to close the subscription to stop listening.
   ///
   /// The sample shows how you could use realtime to listen to changes in a collections.
   ///