[docs] Add example of stripping directions from type (#2074)

* [docs] Add example of stripping directions from type

* Apply suggestions from code review

Co-authored-by: Megan Wachs <megan@sifive.com>

* Improve := comment

Co-authored-by: Megan Wachs <megan@sifive.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>