Comments stating desired return would drastically improve later exercises

[bnewland123]

I went through these as a self test for fun. Most of it is incredibly easy, but I feel like some of the exercises (particularly in the functions and modules sections) are quite vague unless you dig into the test. If that's the intention fine, but I feel like a few well placed comments would make a world of difference in being able to complete these at a clip.

[rmurphey]

If you have an idea of what this should look like, please submit a pull request.

[antony]

@bnewland123 one thing I like to assess people on is their use of either comments or clean, readable, descriptive code to express intent. You can guess which one scores higher :)