Add docs that show new features of the Results class

[semaphoreP]

Is your feature request related to a problem? Please describe.
The Results class has quite a few nifty features now, and it would be great to have a tutorial to show them off. It will make it easier for users to do any custom calculations.

Describe the solution you'd like
Documentation showing useful features like labels, data, param_idx, and how to link to the system class to compute orbits (e.g., for making orbit predicitons).

Describe alternatives you've considered
Answering individual emails from people who have questions about it

Additional context