Merge pull request #155 from jinglong/master

update chapter3
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笔误
Merge pull request #158 from RocFang/patch-3

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*   NGX_HTTP_LMT_CONF: 可以出现在http里面的limit_except指令的block中。
*   NGX_HTTP_LIF_CONF: 可以出现在http里面的location配置指令里的if语句所在的block中。
Merge pull request #159 from RocFang/patch-4

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笔误：
可以直接赋值个set字段使用---->可以直接赋值给set字段使用
Merge pull request #161 from RocFang/patch-6

Update chapter_03.rst, fix a typo, thanks to RocFang
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另一个参数是hello_counter，如果设置为on
---->另一个指令是hello_counter，如果设置为on
Merge pull request #162 from RocFang/patch-7

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u->status->status
------>
u->state->status
Update chapter_07.rst

笔误，显示->显式
Merge pull request #164 from RocFang/patch-8

Update chapter_07.rst, fix a typo, thanks to RocFang.
Merge pull request #163 from RocFang/patch-3

Update chapter_05.rst, fix a typo, thanks to RocFang.
Update chapter_02.rst

fix wrong words
Merge pull request #165 from scottkiss/patch-1

Update chapter_02.rst, fix a typo, thanks to scottkiss.
update chapter 2