Chapter 11, 'Promises, async/await', assumes knowledge of DOM manipulation not yet taught

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DOM manipulation is not covered in this tutorial until four chapters later, in Part 2. From the comments, it looks like some are ready for it and some are not. I don't know if the async stuff could be explained well without using DOM examples, and I haven't looked at the DOM chapter much, so don't know if it requires stuff from Part 1 beyond Chapter 10, but maybe it could be moved up, or referenced, or some short primer or in-context explanations provided to get people unfamiliar with the subject through the async chapter.

结合第 2 部分的 DOM 章节和现有注释，审阅第 11 章“Promises, async/await”。确定该章节是否应移动、引用后续材料或添加入门说明，然后在编辑之前定义明确的教学方法和完成标准。

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