[manifest] Abstract: clarifies new reader ambiguity (#423)

Clarifies that the manifest is a file
Clarifies "this" reference on line 84 is referring to metadata (and not web application)
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/423

-- Commit Summary --

  * Abstract: clarifies new reader ambiguity

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/manifest/pull/423.patch
https://github.com/w3c/manifest/pull/423.diff

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https://github.com/w3c/manifest/pull/423