[w3c/uievents] Add back and forward mouse buttons to ui event spec. (#190)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/uievents/pull/190

-- Commit Summary --

  * Add back and forward mouse buttons to ui event spec.

-- File Changes --

    M index.html (6475)
    M sections/event-types.txt (2)

-- Patch Links --

https://github.com/w3c/uievents/pull/190.patch
https://github.com/w3c/uievents/pull/190.diff

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