[w3c/manifest] Chore: Replace "media type" with "MIME type". (#824)

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative requirements
* [ ] Adds new normative recommendations or optional items
* [ ] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [X] Is a "chore" (metadata, formatting, fixing warnings, etc).

Commit message:

Per note in https://mimesniff.spec.whatwg.org/#mime-type

Closes #822.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/824

-- Commit Summary --

  * Chore: Replace "media type" with "MIME type".

-- File Changes --

    M index.html (41)

-- Patch Links --

https://github.com/w3c/manifest/pull/824.patch
https://github.com/w3c/manifest/pull/824.diff

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