[w3c/manifest] editorial: Refine the definition of an installable web application (PR #1164)

PR #1163 added a definition of installable web applications. After code review comments had been addressed the resulting text included the sentence "Any website is an installable web application." I don't think that the vast majority of web developers would agree with this statement, and to me it seems to directly conflict with the text that follows which defines an _installed_ web application as one which has (or will have) a manifest applied to its top level browsing context. To me this clearly indicates that a website can not be an installable web application unless it at least has a web application manifest, even if only an empty manifest with defaults applied.

This is a suggestion to refine that text to address my review comments in #1163.

Specifically:
- What differentiates an installable web application from other websites is that it links to a web application manifest
- A manifest is applied when an installed web application is launched

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

Commit message:

Refine the definition of an installable web application

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


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

  https://github.com/w3c/manifest/pull/1164

-- Commit Summary --

  * editorial: Refine the definition of an installable web application

-- File Changes --

    M index.html (9)

-- Patch Links --

https://github.com/w3c/manifest/pull/1164.patch
https://github.com/w3c/manifest/pull/1164.diff

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