Minor fixes

Author: dagnir

http-clients/netty-nio-client/src/main/java/software/amazon/awssdk/http/nio/netty/internal/AutoReadDisableChannelPoolListener.java

@@ -22,7 +22,7 @@
  * Disables auto read on in-use channels to allow upper layers to take care of flow control.
  */
 @SdkInternalApi
-public class AutoReadDisableChannelPoolListener implements ListenerInvokingChannelPool.ChannelPoolListener {
+public final class AutoReadDisableChannelPoolListener implements ListenerInvokingChannelPool.ChannelPoolListener {
     private static final AutoReadDisableChannelPoolListener INSTANCE = new AutoReadDisableChannelPoolListener();
 
     @Override

http-clients/netty-nio-client/src/main/java/software/amazon/awssdk/http/nio/netty/internal/AutoReadEnableChannelPoolListener.java

@@ -22,7 +22,7 @@
  * Enables auto read on idle channels so that any data that a service sends while it's idling can be handled.
  */
 @SdkInternalApi
-public class AutoReadEnableChannelPoolListener implements ListenerInvokingChannelPool.ChannelPoolListener {
+public final class AutoReadEnableChannelPoolListener implements ListenerInvokingChannelPool.ChannelPoolListener {
     private static final AutoReadEnableChannelPoolListener INSTANCE = new AutoReadEnableChannelPoolListener();
 
     @Override

http-clients/netty-nio-client/src/main/java/software/amazon/awssdk/http/nio/netty/internal/AwaitCloseChannelPoolMap.java

@@ -250,7 +250,7 @@ private SdkChannelPool wrapBaseChannelPool(Bootstrap bootstrap, ChannelPool chan
             // Add a listener that removes request-specific handlers with each request.
             HandlerRemovingChannelPoolListener.create(),
 
-            // Add a listner that enables auto reads on released connections.
+            // Add a listener that enables auto reads on released connections.
             AutoReadEnableChannelPoolListener.create()
         ));