Update 02_Basic_Operators.html

Fixed a typo
Fixed #136: Typos in chap2.6
[2.1基础部分] : 把非代码部分的英文括号修改成中文括号，修改部分错别字
test swift syntax hightlighting
return to former syntax
Merge pull request #143 from lzw120/gh-pages

Update 02_Basic_Operators.html
Merge pull request #145 from yankuangshi/develop

[2.1基础部分] : 把非代码部分的英文括号修改成中文括号，修改部分错别字
Merge pull request #144 from umcsdon/gh-pages

Fixed #136: Typos in chap2.6
make gitbook
Update README.md
Fixed #148
Fixed #142
new branch to rebase
Add swift highlight
add highlight to chapter 1.2

add swift highlight
Merge pull request #150 from zac1st1k/gh-pages

Add swift highlight to chapter 1.2
Merge pull request #149 from xielingwang/proofreading

new branch to rebase:语法总结
修改02_Lexical_Structure.md里的代码块标示
添加swift标签source/chapter2/23_Advanced_Operators.md
添加swift标签:06_Functions.md