Document generic ride information (ratings, admission price, popularity, maintenance)

[halfbro]

There should be some ride-agnostic documentation related to ride ratings, admission price, popularity, and maintenance costs - what the actual numbers are, how they affect pricing, how to manage them.

Individual ride types would get their own information if they need to expand on these things (roller coasters can control their stats much more than something like bumper cars can, for example).