fix sphinx warnings

4 jobs for annot in 19 minutes and 52 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Build
passed #126644
docker
build_linux_27

00:18:09

64.0%
passed #126645
docker
build_linux_36

00:18:07

64.0%
passed #126646
macosx
build_macosx_27

00:19:16

64.0%
passed #126647
macosx
build_macosx_36

00:19:50

64.0%