MAINT: minor cleanup of unsupported sphinx workarounds

[bsipocz]

Noticed that this cleanup was left out from #213

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.83%. Comparing base (dd9b3a0) to head (e538cf8).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
+ Coverage   89.69%   89.83%   +0.13%     
==========================================
  Files          31       31              
  Lines        1252     1249       -3     
==========================================
- Hits         1123     1122       -1     
+ Misses        129      127       -2     

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[pllim]

Thanks!