[w3c/manifest] Editorial: cite UAX9 not BIDI (PR #1131)

See #1081 (doesn't close it)

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:

@aphillips suggested we switch to citing UAX9 instead.


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<a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/pull/1131.html" title="Last updated on Jun 7, 2024, 5:14 AM UTC (ed9c158)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/1131/55e6818...ed9c158.html" title="Last updated on Jun 7, 2024, 5:14 AM UTC (ed9c158)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1131

-- Commit Summary --

  * Editorial: cite UAX9 not BIDI

-- File Changes --

    M index.html (12)

-- Patch Links --

https://github.com/w3c/manifest/pull/1131.patch
https://github.com/w3c/manifest/pull/1131.diff

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