Text not matching code snippets in chapter 57a

[PierreGuyot]

rustrogueliketutorial/book/src/chapter_57a.md

Line 626 in 33872fe

Notice the `TODO`: we're going to want to look at that before we are done. We're moving entities around - and not updating the spatial map.

There is no TODO in the matching code snippet, so this part of the text is likely outdated.
My understanding is that this section is now already applied in the snippet and must be removed.