update tutorials

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 * Issues: https://github.com/alibaba/arthas/issues
 * 文档: https://arthas.aliyun.com/doc
 * Documentation: https://arthas.aliyun.com/doc/en
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+欢迎关注公众号，获取Arthas项目的信息、源码分析、案例实践。
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+![Arthas公众号](./assets/qrcode_gongzhonghao.jpg)