docs: Add use citation from single leptoquark B-physics anomalies paper

[lukasheinrich]

Description

Add use citation from On the single leptoquark solutions to the B-physics anomalies by Andrei Angelescu, Damir Bečirević, Darius A. Faroughy, Florentin Jaffredo, Olcyr Sumensari 🚀

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* Add use citation from 'On the single leptoquark solutions to the B-physics anomalies'
   - c.f. https://inspirehep.net/literature/1853087

[codecov]

Codecov Report

Merging #1416 (59abb13) into master (671ed56) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1416   +/-   ##
=======================================
  Coverage   97.55%   97.55%           
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  Files          63       63           
  Lines        3837     3837           
  Branches      541      541           
=======================================
  Hits         3743     3743           
  Misses         55       55           
  Partials       39       39           

Flag	Coverage Δ
contrib	24.08% <ø> (ø)
unittests	97.55% <ø> (ø)

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