Fix checkstyle so the build passes

src/main/java/io/netty/buffer/b2/Buf.java

@@ -152,8 +152,8 @@ public interface Buf extends Rc<Buf>, BufAccessors {
      *
      * @param offset The writer offset to set.
      * @return This Buf.
-     * @throws IndexOutOfBoundsException if the specified {@code offset} is less than the current {@link #readerOffset()}
-     *                                   or greater than {@link #capacity()}.
+     * @throws IndexOutOfBoundsException if the specified {@code offset} is less than the current
+     * {@link #readerOffset()} or greater than {@link #capacity()}.
      */
     Buf writerOffset(int offset);
 

src/main/java/io/netty/buffer/b2/BufAccessors.java

@@ -18,7 +18,8 @@ package io.netty.buffer.b2;
 /**
  * This interface is just the primitive data accessor methods that {@link Buf} exposes.
  * It can be useful if you only need the data access methods, and perhaps wish to decorate or modify their behaviour.
- * Usually, you'd use the {@link Buf} interface directly, since this lets you properly control the buffer reference count.
+ * Usually, you'd use the {@link Buf} interface directly, since this lets you properly control the buffer reference
+ * count.
  */
 public interface BufAccessors {
     // <editor-fold defaultstate="collapsed" desc="Primitive accessors interface.">

src/test/java/io/netty/buffer/b2/ScopeTest.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2020 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:
+ *
+ *   https://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.
+ */
 package io.netty.buffer.b2;
 
 import org.junit.Test;