Fixed some checkstyle errors

transport/src/main/java/io/netty/bootstrap/package-info.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2012 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+/**
+ * The helper classes with fluent API which enable an easy implementation of
+ * typical client side and server side channel initialization.
+ *
+ * @apiviz.landmark
+ * @apiviz.exclude ^io\.netty\.util\.
+ */
+package io.netty.bootstrap;

transport/src/main/java/io/netty/channel/AbstractChannel.java

@@ -746,7 +746,7 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
         }
     }
 
-    static abstract class FlushCheckpoint {
+    abstract static class FlushCheckpoint {
         abstract long flushCheckpoint();
         abstract void flushCheckpoint(long checkpoint);
         abstract ChannelFuture future();

transport/src/main/java/io/netty/channel/SingleThreadEventExecutor.java

@@ -503,7 +503,7 @@ public abstract class SingleThreadEventExecutor extends AbstractExecutorService
 
         private final long id = nextTaskId.getAndIncrement();
         private long deadlineNanos;
-        /** 0 - no repeat, >0 - repeat at fixed rate, <0 - repeat with fixed delay */
+        /* 0 - no repeat, >0 - repeat at fixed rate, <0 - repeat with fixed delay */
         private final long periodNanos;
 
         ScheduledFutureTask(Runnable runnable, V result, long nanoTime) {