[PR #8953/51ea3b39 backport][3.11] Add clarification about auth parameter in ClientSession

[patchback]

This is a backport of PR #8953 as merged into master (51ea3b3).

What do these changes do?

These changes clarify the behavior of the auth parameter in ClientSession.

Are there changes in behavior for the user?

No.

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

No.

Related issue number

#6764

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
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  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES/ folder

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  • 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 97.73%. Comparing base (784604e) to head (5523c4b).
Report is 574 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #8955   +/-   ##
=======================================
  Coverage   97.73%   97.73%           
=======================================
  Files         108      108           
  Lines       34319    34319           
  Branches     4073     4073           
=======================================
  Hits        33542    33542           
  Misses        581      581           
  Partials      196      196           

Flag	Coverage Δ
CI-GHA	97.63% <ø> (ø)
OS-Linux	97.31% <ø> (+<0.01%)	⬆️
OS-Windows	94.87% <ø> (ø)
OS-macOS	97.01% <ø> (+<0.01%)	⬆️
Py-3.10.11	97.08% <ø> (ø)
Py-3.10.14	97.02% <ø> (ø)
Py-3.11.9	97.25% <ø> (ø)
Py-3.12.5	97.35% <ø> (ø)
Py-3.9.13	96.99% <ø> (ø)
Py-3.9.19	96.93% <ø> (ø)
Py-pypy7.3.16	96.52% <ø> (ø)
VM-macos	97.01% <ø> (+<0.01%)	⬆️
VM-ubuntu	97.31% <ø> (+<0.01%)	⬆️
VM-windows	94.87% <ø> (ø)

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