fix: 修正了对于move关键字闭包借用变量的描述;添加了3种Fn特征的承接文字 #1408
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由于move关键字的存在,所以s的所有权移交给了闭包,而不是不可变引用。修改以后为了保证上下文的连贯性,我在“三种 Fn 的关系”上面添加了一句承接性的疑问句。