Fixed: Typo in Chap#2.9
remove duplication
Update 10_Properties.html

remove duplications
Merge pull request #190 from umcsdon/patch-1

Fixed: Typo in Chap#2.9
Merge pull request #191 from stanzhai/develop

【Fix】 2.1 the basics[ref style]引用风格，保持前后一致
Merge pull request #192 from wesleysui/gh-pages

remove duplication
Corrected spelling.

Corrected "标示" to "标识".
Fixed the missing character.

Fixed the missing character "性" of "属性".
Corrected spelling.

Corrected "重新" from "从新".
修改错误的标点
添加官方web版图书自带的playground版《初见》，可以直接在playground中阅读该章节，并直接在自带的源代码中做要求的练习。
添加链接，指向中文playground版本的初见，可以直接在playground中阅读该章节，并直接在自带的源代码中做要求的练习。
多处<h2>的id有问题，已修正
Fixed translation, reordered words order.

Fixed translation, reordered words order.
Fixed link.

Fixed link for Associated Values.
Merge pull request #198 from twlkyao/gh-pages

Fixed translation, reordered words order.
Merge pull request #196 from twlkyao/patch-1

Corrected spelling.
Merge pull request #195 from twlkyao/patch-1

Fixed the missing character.
Merge pull request #194 from stanzhai/develop

fix 1.2 a swift tour [ref style]
Merge pull request #193 from twlkyao/patch-2

Corrected spelling.