Markdown: fix defmodule to avoid printing the package in the example
fix markdown example file to make test pass
original commit: fc3321481ce9928eaeea393302a0c0f187937271
The "racket" directory contains a pared-back version of the
repository, roughly.
The "pkgs" directory everything else in the repository, but
organized into packages.
original commit: b2ebb0a28bf8136e75cd98316c22fe54c30eacb2