in the Prepare section, i would suggest changing this:
The tutorial app is a simple web service for storing notes, built with Servant.
The app includes a Cabal package description file, haskell-on-heroku-tutorial.cabal file, used to declare dependencies, and a Halcyon constraints file, .halcyon/constraints file, used to declare version constraints.
to this:
Every Haskell on Heroku project must contain at least the source files, and a .cabal file describing the package. The tutorial app, which is a simple web service for storing notes built with Servant, has both of these, plus some extra files, such as a readme, and a Halcyon constraints file .halcyon/constraints, used to declare version constraints.
in the Prepare section, i would suggest changing this:
to this: