Small fix to math rendering in docs

[MatteoRobbiati]

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (42867eb) 100.00% compared to head (f73be7c) 100.00%.

❗ Current head f73be7c differs from pull request most recent head 498857d. Consider uploading reports for the commit 498857d to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1223   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           70        70           
  Lines        10379     10379           
=========================================
  Hits         10379     10379           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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