[sphinx] Fixed doc test

4 jobs for doctest in 4 minutes and 41 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #181885
docker
build_linux_36

00:04:37

37.0%
passed #181886
docker
build_linux_37

00:04:35

37.0%
passed #181883
macosx
build_macosx_36

00:04:41

37.0%
passed #181884
macosx
build_macosx_37

00:04:37

37.0%