fix require example usage
fix require example usage

Example for require interface was incorrect. This fixes the erroneous documentation.
hoverduck/mocha,boneskull/mocha,adamgruber/mocha,adamgruber/mocha,adamgruber/mocha,outsideris/mocha,hoverduck/mocha,igwejk/mocha,mochajs/mocha,mochajs/mocha,boneskull/mocha,igwejk/mocha,mochajs/mocha,hoverduck/mocha,hoverduck/mocha,boneskull/mocha,outsideris/mocha