Fix irrelevant URLs to Gunicorn docs

[serhiiur]

What do these changes do?

Fix irrelevant URLs pointing to the corresponding sections in the documentation of Gunicorn to avoid 404 pages since the upgrade of the Gunicorn's website.

Are there changes in behavior for the user?

No

Is it a substantial burden for the maintainers to support this?

No

Related issue number

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES/ folder

  • name it <issue_or_pr_num>.<type>.rst (e.g. 588.bugfix.rst)

  • if you don't have an issue number, change it to the pull request
    number after creating the PR

    • .bugfix: A bug fix for something the maintainers deemed an
      improper undesired behavior that got corrected to match
      pre-agreed expectations.
    • .feature: A new behavior, public APIs. That sort of stuff.
    • .deprecation: A declaration of future API removals and breaking
      changes in behavior.
    • .breaking: When something public is removed in a breaking way.
      Could be deprecated in an earlier release.
    • .doc: Notable updates to the documentation structure or build
      process.
    • .packaging: Notes for downstreams about unobvious side effects
      and tooling. Changes in the test invocation considerations and
      runtime assumptions.
    • .contrib: Stuff that affects the contributor experience. e.g.
      Running tests, building the docs, setting up the development
      environment.
    • .misc: Changes that are hard to assign to any of the above
      categories.

  • Make sure to use full sentences with correct case and punctuation,
    for example:

    Fixed issue with non-ascii contents in doctest text files
    -- by :user:`contributor-gh-handle`.

    Use the past tense or the present tense a non-imperative mood,
    referring to what's changed compared to the last released version
    of this project.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.95%. Comparing base (d2c203f) to head (5d49685).
⚠️ Report is 4 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #12703   +/-   ##
=======================================
  Coverage   98.95%   98.95%           
=======================================
  Files         131      131           
  Lines       46688    46688           
  Branches     2421     2421           
=======================================
  Hits        46200    46200           
  Misses        366      366           
  Partials      122      122           

Flag	Coverage Δ
Autobahn	22.42% <ø> (ø)
CI-GHA	98.92% <ø> (ø)
OS-Linux	98.67% <ø> (-0.02%)	⬇️
OS-Windows	97.03% <ø> (ø)
OS-macOS	97.93% <ø> (-0.01%)	⬇️
Py-3.10	98.15% <ø> (-0.01%)	⬇️
Py-3.11	98.41% <ø> (-0.01%)	⬇️
Py-3.12	98.50% <ø> (ø)
Py-3.13	98.48% <ø> (ø)
Py-3.14	98.50% <ø> (ø)
Py-3.14t	97.55% <ø> (-0.01%)	⬇️
Py-pypy-3.11	97.41% <ø> (-0.04%)	⬇️
VM-macos	97.93% <ø> (-0.01%)	⬇️
VM-ubuntu	98.67% <ø> (-0.02%)	⬇️
VM-windows	97.03% <ø> (ø)
cython-coverage	37.94% <ø> (ø)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 72 untouched benchmarks
⏩ 72 skipped benchmarks¹

---

_{Comparing serhiiur:fix-gunicorn-docs-references (5d49685) with master (7f0532c)}

Footnotes

1. 72 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩