[w3c/manifest] Editorial: Moved non-normative text into a note. (#702)

This is just re-stating a rule expressed elsewhere. Also changed "added to home-screen or otherwise bookmarked" to "installed" (which is formal language defined in this spec).
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/702

-- Commit Summary --

  * Applying the manifest: Moved non-normative text into a note.
  * Use the language 'installed', consistent with the rest of the spec.
  * Link 'installed'.

-- File Changes --

    M index.html (10)

-- Patch Links --

https://github.com/w3c/manifest/pull/702.patch
https://github.com/w3c/manifest/pull/702.diff

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