fix number error
Merge pull request #537 from pandamicro/master

[Cocos2d-JS] Docs for 3.1 beta release
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统一大小写
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Merge pull request #552 from purpleenjae/patch-14

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Merge pull request #551 from purpleenjae/patch-13

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Merge pull request #550 from purpleenjae/patch-12

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Merge pull request #549 from purpleenjae/patch-11

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