Add link to "Lint passes"

Author: blyxyas

book/src/development/defining_lints.md

@@ -34,8 +34,8 @@ $ cargo dev new_lint --name=foo_functions --pass=late --category=pedantic
 There are two things to note here:
 
 1. We set `--pass=late` in this command to do a late lint pass. The alternative
-is an `early` lint pass. We will discuss this difference in a later chapter.
-<!-- FIXME: Link that "later chapter" when lint_passes.md is merged -->
+is an `early` lint pass. The difference is discussed in the chapter [Lint Passes](adding_lints.md#lint-passes).
+<!-- FIXME: Change that lint to the Lint Passes chapter when that gets merged -->
 2. If not provided, the `category` of this new lint will default to `nursery`.
 See Clippy's [lint types](../lints.md) for more information on categories.