[whatwg/fetch] Encourage web browser User-Agent value to start with `Mozilla/5.0 (` (PR #1855)

This matches what all major web browsers already do and navigator.appVersion relies on this to a fault. See https://github.com/whatwg/html/issues/11630 for context.


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<a href="https://whatpr.org/fetch/1855.html" title="Last updated on Sep 9, 2025, 4:31 PM UTC (c560ab5)">Preview</a> | <a href="https://whatpr.org/fetch/1855/79b4314...c560ab5.html" title="Last updated on Sep 9, 2025, 4:31 PM UTC (c560ab5)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1855

-- Commit Summary --

  * Encourage web browser User-Agent value to start with `Mozilla/5.0 (`

-- File Changes --

    M fetch.bs (4)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1855.patch
https://github.com/whatwg/fetch/pull/1855.diff

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