Update zh.md
Merge pull request #378 from gloryming/master

fix cases
modify wrong words.
Merge pull request #377 from renshan/patch-1

Update zh.md
Merge branch 'master' of https://github.com/cocos2d/cocos-docs
Merge pull request #379 from Ivenyang/master

modify wrong words.
change link to translated version
Create ko.md
Merge pull request #380 from sincntx/master

Translate english to korean
[Cocos2d-JS] Improve change log and upgrade guide
Merge branch 'master' of https://github.com/cocos2d/cocos-docs
Create ko.md
Update ko.md
Update ko.md
Update ko.md
Merge pull request #381 from sincntx/master

Translate english to korean
[Cocos2d-JS] Finish chinese upgrade guide for 3.0 rc0
Merge branch 'master' of https://github.com/cocos2d/cocos-docs
Merge pull request #382 from pandamicro/master

[Cocos2d-JS] Improve change log and upgrade guide
[Cocos2d-JS] Update catalogs