[w3c/manifest] Editorial: Trim `dir`, `display`, `orientation`, text and color values (PR #1140)

The three browser engines trim the `dir`, `display`, `orientation`, text, and color values, but it is not mentioned in the specification. This PR adds this as an extra step to the algorithms that process those values.

Example:

* [Chromium](https://github.com/chromium/chromium/blob/main/third_party/blink/renderer/modules/manifest/manifest_parser.cc#L691)
* [Gecko](https://github.com/mozilla/gecko-dev/blob/master/dom/manifest/ManifestProcessor.sys.mjs#L187)
* [WebKit](https://github.com/WebKit/WebKit/blob/main/Source/WebCore/Modules/applicationmanifest/ApplicationManifestParser.cpp#L196)

---

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)

Implementation commitment (delete if not making normative changes):

* [x] WebKit (https://bugs.webkit.org)
* [x] Chromium (https://bugs.chromium.org/)
* [x] Gecko (http://bugzilla.mozilla.org)

Commit message:

Editorial: Trim `dir`, `display`, `orientation`, text and color values

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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<a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/pull/1140.html" title="Last updated on Aug 22, 2024, 6:27 PM UTC (ca43e7d)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/1140/84b2080...ca43e7d.html" title="Last updated on Aug 22, 2024, 6:27 PM UTC (ca43e7d)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1140

-- Commit Summary --

  * Editorial: Trim `dir`, `display`, `orientation`, text and color values

-- File Changes --

    M index.html (15)

-- Patch Links --

https://github.com/w3c/manifest/pull/1140.patch
https://github.com/w3c/manifest/pull/1140.diff

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