UniqueDisplayNameIsInUse

已修复，此issue关闭

物理文档已重构 因此此pr关闭

已添加相关的文档，因此此pr关闭 https://docs.cocos.com/creator/manual/zh/shader/write-effect-overview.html https://docs.cocos.com/creator/manual/zh/editor/extension/readme.html

已更新文档 该issue 关闭

物理引擎文档已更新，此PR关闭

Thanks for the feedback, the issue has been forwarded to the development team

Thank you for your feedback. This issue has been fowarded to the develop team

你好，请说下是那一段的时候出现的问题

Hi, Thank you for your feedback. It looks awesome.  We can keep an eye on this issue to improve the manual. @MrKylinGithub