[w3c/manifest] A few minor clarifications & typo fixes. (#596)

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

  https://github.com/w3c/manifest/pull/596

-- Commit Summary --

  * fix some typos
  * minor fix

-- File Changes --

    M index.html (21)

-- Patch Links --

https://github.com/w3c/manifest/pull/596.patch
https://github.com/w3c/manifest/pull/596.diff

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