Fix inconsitencies in docs and examples, added ingredient name as a field in the ingredient dict

[jordanhatcher]

Hello! I've been using openrecipeformat for a project I'm working on, and noticed some inconsistencies between the docs and the examples. This PR fixes some of those.

I also included changes to put the ingredient name as a field inside the ingredient dict. I found the current implementation harder to parse and validate, and I think this change makes it a bit easier to do.

Let me know if you have any feedback!