docs: Add use citation from Anomalous Hadronic Higgs at the LHeC paper

[matthewfeickert]

Description

Add use citation from Prospects of Searches for Anomalous Hadronic Higgs Boson Decays at the LHeC by Subhasish Behera, Manuel Hageluken, and Matthias Schott.

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• 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 use citation from 'Prospects of Searches for Anomalous Hadronic
  Higgs Boson Decays at the LHeC'.
   - c.f. https://inspirehep.net/literature/2636748

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4377bdf) 98.30% compared to head (27874ca) 98.30%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2126   +/-   ##
=======================================
  Coverage   98.30%   98.30%           
=======================================
  Files          69       69           
  Lines        4531     4531           
  Branches      645      645           
=======================================
  Hits         4454     4454           
  Misses         45       45           
  Partials       32       32           

Flag	Coverage Δ
contrib	97.88% <ø> (ø)
doctest	61.15% <ø> (ø)
unittests-3.10	96.31% <ø> (ø)
unittests-3.8	96.33% <ø> (ø)
unittests-3.9	96.35% <ø> (ø)

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[matthewfeickert]

Relevant RTD build: https://pyhf--2126.org.readthedocs.build/en/2126/citations.html#use-citations

[matthewfeickert]

I'm going to approve and merge this myself. As always, PRs approved by a single core dev can be reverted as needed by the rest of the dev team.