fix typo error

fix typo error
fix typo error

fix typo error
Merge pull request #102 from wilsonwen/patch-1

fix typo error. Thanks to wilsonwen.
Merge pull request #101 from wilsonwen/master

fix typo error. Thanks to wilsonwen.
错别字
Merge pull request #103 from wilsonwen/master

fix typo. thanks to wilsonwen
fix typo error
Merge pull request #107 from aCayF/master

fix typo error. thanks to aCayF
Update chapter_03.rst

删除掉未使用的clcf变量避免编译时出现-Werror=unused-variable错误
Update chapter_02.rst

'0' 修改'\0' 在sphinx中\为反转义符号,所以在普通文字中写的时候需要'\\0'来表示。
Merge pull request #112 from chengpohi/patch-2

Update chapter_03.rst
Merge pull request #113 from chengpohi/patch-3

Update chapter_02.rst
Update chapter_02.rst

修改了ngx_string、ngx_str_null、ngx_str_set、ngx_str_null的说明
Merge pull request #115 from notishell/master

Modify chapter_02.rst, update the introduction of ngx_str_t apis, thanks to notishell.
Update chapter_02.rst

Add "typedef struct ngx_chain_s ngx_chain_t;"
Update chapter_02.rst

修改错字“也”为“页”
Merge pull request #117 from notishell/patch-2

Update chapter_02.rst, fix typo, thanks to notishell.
Merge pull request #116 from notishell/patch-1

Update chapter_02.rst, thanks to notishell
fix chapter_02.rst main event loop's pseudocode indentation issue.
Merge pull request #119 from BrytonLee/master

fix chapter_02.rst main event loop's pseudocode indentation issue.