[sphinx] Fixing warnings

4 jobs for merge-bob.bio in 17 minutes and 35 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #212124
docker
build_linux_36

00:17:31

passed #212125
docker
build_linux_37

00:16:38

passed #212122
macosx
build_macosx_36

00:17:31

passed #212123
macosx
build_macosx_37

00:16:52