Fix warnings in RTD

[jeremyliweishih]

trafficstars

Fixes #3620.

[codecov[bot]]

Codecov Report

Merging #3703 (aa250f3) into main (e93f513) will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##            main   #3703   +/-   ##
=====================================
  Coverage   99.7%   99.7%           
=====================================
  Files        339     339           
  Lines      34307   34307           
=====================================
  Hits       34179   34179           
  Misses       128     128           

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