[w3c/manifest] Editorial: fix typo (#828)

Closes #???

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative requirements
* [ ] Adds new normative recommendations or optional items
* [x] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [ ] Is a "chore" (metadata, formatting, fixing warnings, etc).
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/828

-- Commit Summary --

  * Editorial: fix typo

-- File Changes --

    M index.html (6)

-- Patch Links --

https://github.com/w3c/manifest/pull/828.patch
https://github.com/w3c/manifest/pull/828.diff

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