[w3c/manifest] Fix typo: is -> to (#812)

This change:
* [ ] 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).

Commit message:
Fix typo: is -> to

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/812

-- Commit Summary --

  * Fix typo: is -> to

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/manifest/pull/812.patch
https://github.com/w3c/manifest/pull/812.diff

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