Clean comments out from production code

[eric-do]

https://github.com/May-Take-A-Second/QuestionsAPI/blob/9b22b52a03c45bdb155c5bab2e4844c3347a52cb/server/controllers.js#L19

Some comments are okay, but things like this - you should remove. Describing your schema in your controller file can easily become outdated and confusing/incorrect if you change your actual schema and don't update this file.