Documents do not completely describe Responsive.Rule.Options

[Xliff]

Using the documents at docs/en/common-responsive-options.md, I am trying to build out some code for responsive
graphs. To do so, I would like to have an exhaustive list of the possibilities provideded by Responsive.Rule.Options.

Are the only things I can change the XAxis, and the Legend?
What object keys are available to the Legend object?
Are there more keys available to the Responsive.Rule.Object object than what is shown on the page?