[w3c/pointerlock] Expanded/clarified introduction (#6)

Probably very subjective, but...perhaps this introduction makes the
intention slightly clearer?
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/pointerlock/pull/6

-- Commit Summary --

  * Expanded/clarified introduction

-- File Changes --

    M index.html (12)

-- Patch Links --

https://github.com/w3c/pointerlock/pull/6.patch
https://github.com/w3c/pointerlock/pull/6.diff

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