[Typo]- In chapter Arrays in the section of loops we have to change `number` to `index`

In chapter Arrays 's section Loops there in sentence The for..of doesn’t give access to the **number** of the current element, just its value, but in most cases that’s enough. And it’s shorter.
Instead of number we have to use index.
Because using number is not really telling us we're talking about index or number (which can be value)

[X] I would love to work on this issue.

打开链接教程页面中的 Arrays 章节及其 Loops 部分，然后找到关于 for..of 和当前元素的句子。将不准确的术语“number”改为“index”，并确认该句清楚地描述了当前元素的索引；未提及测试。