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(1) 修改漏洞例子合约代码注释与代码不一致的错误;
(2) 多处 typo;
What type of PR is this (这是什么类型的PR)
Which issue(s) this PR fixes(Optional) (这个PR 修复了什么问题 (可选择))
What this PR does / why we need it (这个PR 做了什么/ 我们为什么需要这个PR)