Update _coverpage.md

Author: Snailclimb

docs/_coverpage.md

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 </p>
 
 <h1 align="center">Java 学习/面试指南</h1>
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 [常用资源](https://shimo.im/docs/MuiACIg1HlYfVxrj/)
 [GitHub](<https://github.com/Snailclimb/JavaGuide>)
 [开始阅读](#java)