[w3c/manifest] Editorial: Fix shortcut icons grammar (#981)

Fix grammar for shortcut icons.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/981

-- Commit Summary --

  * Fix grammar

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/manifest/pull/981.patch
https://github.com/w3c/manifest/pull/981.diff

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https://github.com/w3c/manifest/pull/981