docs: Add ATLAS s-channel single top cross-section statistical model record

[matthewfeickert]

Description

• Add ATLAS measurement of the s-channel single top cross-section at 13 TeV statistical model HEPDdata record.
  • c.f. https://www.hepdata.net/record/ins2153660
  • Corresponding INSPIRE record: https://inspirehep.net/literature/2153660

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Add ATLAS measurement of the s-channel single top cross-section at 13 TeV
  statistical model HEPDdata record.
   - c.f. https://www.hepdata.net/record/ins2153660
   - Corresponding INSPIRE record: https://inspirehep.net/literature/2153660

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (a797e64) 98.28% compared to head (95369ce) 98.28%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2324   +/-   ##
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  Coverage   98.28%   98.28%           
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  Files          69       69           
  Lines        4538     4538           
  Branches      803      803           
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  Hits         4460     4460           
  Misses         45       45           
  Partials       33       33           

Flag	Coverage Δ
contrib	97.86% <ø> (ø)
doctest	60.99% <ø> (ø)
unittests-3.10	96.29% <ø> (ø)
unittests-3.11	96.29% <ø> (ø)
unittests-3.8	96.31% <ø> (ø)
unittests-3.9	96.34% <ø> (ø)

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