- briefly explain "node" and "leaf"
- cite collapsible & eidetic papers
- use the collapsible `deftech` in 2 places
- fix a typo, rename a free variable
- add links to 'tree node' and 'tree leaves'
This reverts commit 41fd4f3a5e.
The problems this change was intended to solve can be solved in other
ways, without loosening guarantees about expansion order. See the
discussion in #2154 for more details.
closes#2154
Using `racket/private/kw-syntax-local` as the source for
`local-expand`, etc., means that modules that re-export that
one (such as `scheme/base`) get the right documentation links.