[whatwg/fetch] Feat/add nosniff examples (PR #1925)

Added a documentation example to the nosniff section to clarify that the user agent must block responses when a strict MIME type match is not met (eg : missing or incorrect Content- Type).This address the ambiguity discussed in the linked issue.

Fixes #636


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<a href="https://whatpr.org/whatwg/1925.html" title="Last updated on Apr 26, 2026, 12:42 PM UTC (38bfd9e)">Preview</a> | <a href="https://whatpr.org/fetch/1925/8099043...38bfd9e.html" title="Last updated on Apr 26, 2026, 12:42 PM UTC (38bfd9e)">Diff</a>
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  https://github.com/whatwg/fetch/pull/1925

-- Commit Summary --

  * Add example for strict nosniff matching
  * Add example for strict nosniff matching

-- File Changes --

    M fetch.bs (9)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1925.patchhttps://github.com/whatwg/fetch/pull/1925.diff
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