issue #3675, fix error word.
Merge branch 'master' of https://github.com/cocos2d/cocos-docs
fixed #3539, remove duplicate article.
fixed #3722, url error in documents.
Merge pull request #107 from Ivenyang/master

replace wrong links.
Merge pull request #106 from u0u0/master

Fix url error in release note, remove duplicate article.
fixed #3675, add english article for WebSocket.
Merge pull request #108 from u0u0/master

fixed #3675, add english article for WebSocket.