[touch-events] Removed initTouchEvent from spec, added back original note (#55)

Fixing #29 

Removed `initTouchEvent` from legacy section and change list. Added back original note about `initTouchEvent` in `TouchEvent`

Preview: https://rawgit.com/choniong/touch-events/revert-initTouchEvent/index.html#h-dictionary-toucheventinit-members
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/touch-events/pull/55

-- Commit Summary --

  * Removed initTouchEvent from spec, added back original note

-- File Changes --

    M index.html (29)

-- Patch Links --

https://github.com/w3c/touch-events/pull/55.patch
https://github.com/w3c/touch-events/pull/55.diff

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https://github.com/w3c/touch-events/pull/55