ReadTimeoutHandler - missing ) within JavaDoc example (netty#8645)

Motivation:

improve docs

Modification:

ReadTimeoutHandler - missing ) within JavaDoc example

No logic/unit tests affected

handler/src/main/java/io/netty/handler/timeout/ReadTimeoutHandler.java

@@ -33,7 +33,7 @@
  *
  * public class MyChannelInitializer extends {@link ChannelInitializer}<{@link Channel}> {
  *     public void initChannel({@link Channel} channel) {
- *         channel.pipeline().addLast("readTimeoutHandler", new {@link ReadTimeoutHandler}(30);
+ *         channel.pipeline().addLast("readTimeoutHandler", new {@link ReadTimeoutHandler}(30));
  *         channel.pipeline().addLast("myHandler", new MyHandler());
  *     }
  * }