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Update 22Generics.md
修正目录层次及若干翻译

修正目录层次及若干翻译
Merge pull request #67 from takalard/master

初稿翻译 22-Generics
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update 02/07
Merge pull request #68 from numbbbbb/master

update 02/07 闭包
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完成初稿 Interacting with Objective-C APIs
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Merge pull request #70 from Jasonbroker/master

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2-4集合类型_初译未自校
翻译完 04Migration
纠正翻译错误