docs: Add use citation from Belle II invisible Z' search

[matthewfeickert]

Description

Add use citation from Search for an invisible Z' in a final state with two muons and missing energy at Belle II. 🚀

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 use citation from 'Search for an invisible Z' in a final state with
  two muons and missing energy at Belle II'.
   - c.f. https://inspirehep.net/literature/2611344

[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.

[matthewfeickert]

Relevant RTD build: https://pyhf--2082.org.readthedocs.build/en/2082/citations.html#use-citations

[codecov]

Codecov Report

Base: 98.30% // Head: 96.33% // Decreases project coverage by -1.96% ⚠️

Coverage data is based on head (35ec4cb) compared to base (8dffdb6).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2082      +/-   ##
==========================================
- Coverage   98.30%   96.33%   -1.97%     
==========================================
  Files          69       69              
  Lines        4531     4531              
  Branches      645      608      -37     
==========================================
- Hits         4454     4365      -89     
- Misses         45      127      +82     
- Partials       32       39       +7     

Flag	Coverage Δ
contrib	?
doctest	?
unittests-3.10	?
unittests-3.8	96.33% <ø> (ø)
unittests-3.9	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pyhf/contrib/viz/brazil.py	15.38% <0.00%> (-84.62%)	⬇️
src/pyhf/contrib/utils.py	63.63% <0.00%> (-36.37%)	⬇️
src/pyhf/schema/variables.py	75.00% <0.00%> (-25.00%)	⬇️
src/pyhf/schema/loader.py	90.90% <0.00%> (-9.10%)	⬇️
src/pyhf/optimize/__init__.py	95.45% <0.00%> (-4.55%)	⬇️
src/pyhf/utils.py	91.83% <0.00%> (-4.09%)	⬇️
src/pyhf/tensor/pytorch_backend.py	94.69% <0.00%> (-3.79%)	⬇️
src/pyhf/infer/test_statistics.py	96.66% <0.00%> (-3.34%)	⬇️
src/pyhf/tensor/tensorflow_backend.py	95.33% <0.00%> (-2.00%)	⬇️
src/pyhf/tensor/jax_backend.py	97.91% <0.00%> (-0.70%)	⬇️

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