[whatwg/fetch] docs: add example for X-Content-Type-Options header (PR #1872)

This PR adds an example demonstrating the use of the `X-Content-Type-Options: nosniff` header.
It includes a simple HTML and response snippet to show how browsers handle MIME type mismatches.


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<a href="https://whatpr.org/fetch/1872.html" title="Last updated on Oct 22, 2025, 11:30 AM UTC (8bb912d)">Preview</a> | <a href="https://whatpr.org/fetch/1872/0e72db8...8bb912d.html" title="Last updated on Oct 22, 2025, 11:30 AM UTC (8bb912d)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1872

-- Commit Summary --

  * docs: add example for X-Content-Type-Options header

-- File Changes --

    M fetch.bs (17)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1872.patch
https://github.com/whatwg/fetch/pull/1872.diff

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