[sphinx] Fixed some sphinx warnings

4 jobs for merge-bob.bio in 15 minutes and 51 seconds (queued for 7 seconds)
Status Job ID Name Coverage
  Build
passed #212509
docker
build_linux_36

00:10:08

59.0%
passed #212510
docker
build_linux_37

00:09:57

59.0%
passed #212507
macosx
build_macosx_36

00:08:18

59.0%
passed #212508
macosx
build_macosx_37

00:15:49

59.0%