[Bug 114441]

[Cmills-4]

I checked out Ruby documentation, and it turns out we were doin g pretty
well; we were just missing a page on the <rb> element. I've added this
now, along with associated compat data and an interactive example:

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/rb
https://github.com/mdn/browser-compat-data/pull/2422
https://github.com/mdn/interactive-examples/pull/1016

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https://bugs.launchpad.net/bugs/114441

Title:
  Gecko Engine does not support the XHTML 1.1 ruby tag

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