API mapping docs point to obsolete URL

[DullReferenceException]

This document:

https://github.com/admc/wd/blob/master/doc/jsonwire-full-mapping.md

...has links to:

http://code.google.com/p/selenium/wiki/JsonWireProtocol

...which redirects to:

https://github.com/seleniumhq/selenium-google-code-issue-archive.

...which is just a placeholder announcing an obsolete page. At first glance, it doesn't look like we have a nice linkable list of commands to point to, but the official documentation of the WebDriver spec does have this section which lists out the endpoints:

https://w3c.github.io/webdriver/webdriver-spec.html#h-list-of-endpoints

Maybe it'd be better to reference that document.