Fixing formatting in QuantumYieldABC

[davidorme]

Description

Fixes formatting error in QuantumYieldABC from :math: role

Fixes #397

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.33%. Comparing base (56ccf57) to head (2921b68).
Report is 9 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #398      +/-   ##
===========================================
+ Coverage    96.27%   96.33%   +0.06%     
===========================================
  Files           34       34              
  Lines         2659     2676      +17     
===========================================
+ Hits          2560     2578      +18     
+ Misses          99       98       -1     

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