[w3c/manifest] Change "A" to "An" (PR #1103)

This change (choose at least one, delete ones that don't apply):

* Makes editorial changes (changes informative sections, or changes normative sections without changing behavior)

Commit message:

Fixes a grammar error.
Changes "A application manifest" to "An application manifest".
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1103

-- Commit Summary --

  * Change "A" to "An"

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/manifest/pull/1103.patch
https://github.com/w3c/manifest/pull/1103.diff

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