[w3c/screen-orientation] Editorial: Introduction edits (#138)

Deleted the bullets and cut down the first paragraph.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/screen-orientation/pull/138

-- Commit Summary --

  * Editorial: Introduction edits

-- File Changes --

    M index.html (25)

-- Patch Links --

https://github.com/w3c/screen-orientation/pull/138.patch
https://github.com/w3c/screen-orientation/pull/138.diff

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