docs: Add use citation from ATLAS UEH displaced jets CalRatio paper

[matthewfeickert]

Description

Add use citation from ATLAS paper Search for neutral long-lived particles in pp collisions at \sqrt{s}=13 TeV that decay into displaced hadronic jets in the ATLAS calorimeter (ANA-EXOT-2019-23).

Congratulations on the nice publication to @masonproffitt and @gordonwatts who were on the analysis team! 🚀

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* Add use citation from 'Search for neutral long-lived particles in pp collisions
at \sqrt{s}=13 TeV that decay into displaced hadronic jets in the ATLAS calorimeter'.
   - ATLAS paper: ANA-EXOT-2019-23
   - c.f. https://inspirehep.net/literature/2043503

[matthewfeickert]

Relevant RTD build: https://pyhf--1802.org.readthedocs.build/en/1802/citations.html#use-citations

[codecov]

Codecov Report

Merging #1802 (219c614) into master (b23452e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1802   +/-   ##
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  Coverage   98.12%   98.12%           
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  Files          64       64           
  Lines        4270     4270           
  Branches      683      683           
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  Hits         4190     4190           
  Misses         46       46           
  Partials       34       34           

Flag	Coverage Δ
contrib	26.25% <ø> (ø)
doctest	60.58% <ø> (ø)
unittests	96.18% <ø> (ø)

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