Fix doc (#384)

Author: hoc081098

lib/src/transformers/dematerialize.dart

@@ -13,14 +13,14 @@ import 'package:rxdart/src/utils/notification.dart';
 ///
 ///     Stream<Notification<int>>
 ///         .fromIterable([Notification.onData(1), Notification.onDone()])
-///         .transform(dematerializeTransformer())
+///         .transform(DematerializeStreamTransformer())
 ///         .listen((i) => print(i)); // Prints 1
 ///
 /// ### Error example
 ///
 ///     Stream<Notification<int>>
 ///         .fromIterable([Notification.onError(Exception(), null)])
-///         .transform(dematerializeTransformer())
+///         .transform(DematerializeStreamTransformer())
 ///         .listen(null, onError: (e, s) { print(e) }); // Prints Exception
 class DematerializeStreamTransformer<T>
     extends StreamTransformerBase<Notification<T>, T> {

lib/src/transformers/materialize.dart

@@ -12,7 +12,7 @@ import 'package:rxdart/src/utils/notification.dart';
 /// ### Example
 ///
 ///     Stream<int>.fromIterable([1])
-///         .transform(materializeTransformer())
+///         .transform(MaterializeStreamTransformer())
 ///         .listen((i) => print(i)); // Prints onData & onDone Notification
 class MaterializeStreamTransformer<T>
     extends StreamTransformerBase<T, Notification<T>> {

lib/src/transformers/skip_until.dart

@@ -8,7 +8,7 @@ import 'dart:async';
 ///       Stream.value(1),
 ///       TimerStream(2, Duration(minutes: 2))
 ///     ])
-///     .transform(skipUntilTransformer(TimerStream(1, Duration(minutes: 1))))
+///     .transform(SkipUntilStreamTransformer(TimerStream(1, Duration(minutes: 1))))
 ///     .listen(print); // prints 2;
 class SkipUntilStreamTransformer<T, S> extends StreamTransformerBase<T, T> {
   final StreamTransformer<T, T> _transformer;