[w3c/manifest] Consistent manifest naming (PR #1099)

Changes all occurrences of "Web App Manifest" to "Web Application Manifest", as the spec was renamed at some point.

~Closes #???~

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)
* Is a "chore" (metadata, formatting, fixing warnings, etc).

Commit message: Editorial: ensure consistency in manifest naming

(Fill in. If making normative changes, describe exactly what the behavioral
difference will be.)

Person merging, please make sure that commits are squashed with one of the following as a commit message prefix:

* chore:
* editorial:
* BREAKING CHANGE:
* And use none if it's a normative change

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

  https://github.com/w3c/manifest/pull/1099

-- Commit Summary --

  * Editorial: ensure consistency in manifest naming

-- File Changes --

    M README.md (4)
    M explainer.md (6)
    M index.html (12)

-- Patch Links --

https://github.com/w3c/manifest/pull/1099.patch
https://github.com/w3c/manifest/pull/1099.diff

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