Merge pull request #3848 from BernardXiong/fix_doc_license

[skip travis] [Doc] Update file header copyright information for license

documentation/coding_style_cn.md

@@ -36,30 +36,15 @@ C语言头文件为了避免多次重复包含，需要定义一个符号。这
 在每个源文件文件头上，应该包括相应的版权信息，Change Log 记录：
 
 ```c
-    /*
-     * File      : rtthread.h
-     * This file is part of RT-Thread RTOS
-     * COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
+/*
+ * Copyright (c) 2006-2020, RT-Thread Development Team
  *
-     *  This program is free software; you can redistribute it and/or modify
-     *  it under the terms of the GNU General Public License as published by
-     *  the Free Software Foundation; either version 2 of the License, or
-     *  (at your option) any later version.
-     *
-     *  This program is distributed in the hope that it will be useful,
-     *  but WITHOUT ANY WARRANTY; without even the implied warranty of
-     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-     *  GNU General Public License for more details.
-     *
-     *  You should have received a copy of the GNU General Public License along
-     *  with this program; if not, write to the Free Software Foundation, Inc.,
-     *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
  * 2006-03-18     Bernard      the first version
  * 2006-04-26     Bernard      add semaphore APIs
-     * ...
  */
 ```
 

documentation/coding_style_en.txt

@@ -42,22 +42,16 @@ In every header file, there should be copyright information and Change Log
 record like this:
 
     /*
-     * File      : rtthread.h
-     * This file is part of RT-Thread RTOS
-     * COPYRIGHT (C) 2006, RT-Thread Development Team
+    * Copyright (c) 2006-2020, RT-Thread Development Team
     *
-     * The license and distribution terms for this file may be
-     * found in the file LICENSE in this distribution or at
-     * http://www.rt-thread.org/license/LICENSE.
+    * SPDX-License-Identifier: Apache-2.0
     *
     * Change Logs:
     * Date           Author       Notes
     * 2006-03-18     Bernard      the first version
     * 2006-04-26     Bernard      add semaphore APIs
-     * ...
     */
 
-
 5. Structure Defines
 
 Please name structures in lower-case and connect words with "_". For example: