[w3c/gamepad] fix typos and tidy up Gamepad Extensions (#43)

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

  https://github.com/w3c/gamepad/pull/43

-- Commit Summary --

  * fix typos and tidy up Gamepad Extensions

-- File Changes --

    M extensions.html (185)

-- Patch Links --

https://github.com/w3c/gamepad/pull/43.patch
https://github.com/w3c/gamepad/pull/43.diff

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