point to the chapter used to close the linked issue

[tshepang]

Also, the issue has since been closed, pointing to the now-linked chapter.

Rendered

[rustbot]

r? @jswrenn

rustbot has assigned @jswrenn.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[jieyouxu]

Thanks