[w3c/manifest] Rewrote Proprietary manifest members section to discourage vendor prefixing. (PR #1073)

Closes #1072

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:

Rewrote Proprietary manifest members section to discourage vendor prefixing.

Previously, this section explicitly asked developers to add vendor prefixing, which is unhealthy for the web long-term, and I don't believe was actually the intention of this section. There is a subtle difference between a feature linked to a proprietary ecosystem and a vendor prefix. The newly written text makes this distinction clear, and allows proprietary ecosystem features whilst discouraging vendor prefixing. Updated examples to match.

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/1073

-- Commit Summary --

  * Rewrote Proprietary manifest members section to discourage vendor prefixing.

-- File Changes --

    M index.html (42)

-- Patch Links --

https://github.com/w3c/manifest/pull/1073.patch
https://github.com/w3c/manifest/pull/1073.diff

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