Update comment style generic syntax

lib/stream_channel.dart

Index: lib/stream_channel.dart
diff --git a/lib/stream_channel.dart b/lib/stream_channel.dart
index 34be085ea85c5dc115907b6cf885653176ae890d..dcbc9a07e7edd6b55dca9d7dc1ee702a01693d91 100644
--- a/lib/stream_channel.dart
+++ b/lib/stream_channel.dart
@@ -108,8 +108,8 @@ abstract class StreamChannel<T> {
   /// Transforms [this] using [transformer].
   ///
   /// This is identical to calling `transformer.bind(channel)`.
-  StreamChannel/*<S>*/ transform/*<S>*/(
-      StreamChannelTransformer<dynamic/*=S*/, T> transformer);
+  StreamChannel<S> transform<S>(
+      StreamChannelTransformer<S, T> transformer);
 
   /// Transforms only the [stream] component of [this] using [transformer].
   StreamChannel<T> transformStream(StreamTransformer<T, T> transformer);
@@ -130,7 +130,7 @@ abstract class StreamChannel<T> {
   /// If any events emitted by [stream] aren't of type [S], they're converted
   /// into [CastError] events. Similarly, if any events are added to [sync] that
   /// aren't of type [S], a [CastError] is thrown.
-  StreamChannel/*<S>*/ cast/*<S>*/();
+  StreamChannel<S> cast<S>();
 }
 
 /// An implementation of [StreamChannel] that simply takes a stream and a sink
@@ -153,8 +153,8 @@ abstract class StreamChannelMixin<T> implements StreamChannel<T> {
     other.stream.pipe(sink);
   }
 
-  StreamChannel/*<S>*/ transform/*<S>*/(
-          StreamChannelTransformer<dynamic/*=S*/, T> transformer) =>
+  StreamChannel<S> transform<S>(
+          StreamChannelTransformer<S, T> transformer) =>
       transformer.bind(this);
 
   StreamChannel<T> transformStream(StreamTransformer<T, T> transformer) =>
@@ -169,6 +169,6 @@ abstract class StreamChannelMixin<T> implements StreamChannel<T> {
   StreamChannel<T> changeSink(StreamSink<T> change(StreamSink<T> sink)) =>
       new StreamChannel.withCloseGuarantee(stream, change(sink));
 
-  StreamChannel/*<S>*/ cast/*<S>*/() => new StreamChannel(
+  StreamChannel<S> cast<S>() => new StreamChannel(
       DelegatingStream.typed(stream), DelegatingStreamSink.typed(sink));
 }