fix incorrect word

Author: peachisai

apm-sniffer/optional-plugins/netty-http-4.1.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/netty/http/ChannelPipelineRemoveLastInterceptor.java

@@ -36,7 +36,7 @@ public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allAr
 
     @Override
     public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes, Object ret) throws Throwable {
-        // If the removed handler is a SkyWalking enhanced handler, we continue removing the next which is the orignal handler before the instrumentation.
+        // If the removed handler is a SkyWalking enhanced handler, we continue removing the next which is the original handler before the instrumentation.
         if (((ChannelHandler) ret).getClass().getName().startsWith(NettyConstants.HANDLER_PACKAGE_NAME)) {
             return ((ChannelPipeline) objInst).removeLast();
         }