update physics docs

[JoneLau]

更新物理文档，由于周期问题（旧 pr 来自 @magelevin ）导致和现版本冲突较多，因此整理出一个新的 pr 处理

Update the physics documentation, due to cycle issues (old pr from @magelevin) resulting in more conflicts with the current version, so a new pr handle has been put together

[slackmoehrle]

Does this need an English version?

[UniqueDisplayNameIsInUse]

物理引擎文档已更新，此PR关闭