[w3c/manifest] Display override editorial (#949)

This change (choose at least one, delete ones that don't apply):

* Makes editorial changes (changes informative sections, or changes normative sections without changing behavior)

Commit message:

Editorial: Created explicit algorithm for choosing display mode, and added extension point for the display_override incubation.

Person merging, please make sure that commits are squashed with one of the following as a commit message prefix:

* editorial:


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<a href="https://pr-preview.s3.amazonaws.com/dmurph/manifest/pull/949.html" title="Last updated on Jan 29, 2021, 11:05 PM UTC (ce327b9)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/949/08629f2...dmurph:ce327b9.html" title="Last updated on Jan 29, 2021, 11:05 PM UTC (ce327b9)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/949

-- Commit Summary --

  * Adding display_override manifest field
  * updated with examples & formatting
  * comments
  * Addressing comments from mgiuca@
  * Matt comments
  * Added algorithm note, addressed example comment
  * missed a few comments
  * Removing display_override specific pieces, and adding an extension point
  * fix whitespace

-- File Changes --

    M index.html (84)

-- Patch Links --

https://github.com/w3c/manifest/pull/949.patch
https://github.com/w3c/manifest/pull/949.diff

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