Update example for helpers.run()

Update example for helpers.run() to use absolute paths instead of relative path.

See https://github.com/yeoman/generator/issues/563
Revert inline comments
Update example for helpers.run() to use absolute paths instead of relative path.

See https://github.com/yeoman/generator/issues/563
Merge branch 'patch-1' of github.com:lauterry/yeoman.io into patch-1
Merge pull request #200 from lauterry/patch-1

Update example for helpers.run()