Fixed some typos in CONTRIBUTING.md
Fixed some typos in CONTRIBUTING.md

There was a reference to `wp` rather than `terminus`. There were
also two links pointed to an old GitHub repo that no longer exists.

Signed-off-by: Elliot J. Voris <dee6300e151043f915cc24dbc1409935bc4ae592@voris.me>

mkudenko/cli,rvtraveller/terminus,pantheon-systems/cli,reynoldsalec/cli,labboy0276/cli,rvtraveller/terminus,labboy0276/cli,devekko/cli,Blueprint-Marketing/cli,dustinleblanc/terminus,labboy0276/cli,Blueprint-Marketing/cli,hugovk/cli,devekko/cli,mkudenko/cli,pantheon-systems/cli,mkudenko/cli,rvtraveller/terminus,reynoldsalec/cli,reynoldsalec/cli,dustinleblanc/terminus,Blueprint-Marketing/cli,dustinleblanc/terminus,hugovk/cli,devekko/cli,pantheon-systems/cli,hugovk/cli