Fixed [sphinx] warning

4 jobs for csvsupport in 12 minutes and 55 seconds
Status Job ID Name Coverage
  Build
passed #235382
docker
build_linux_37

00:06:37

84.0%
passed #235383
docker
build_linux_38

00:06:34

84.0%
passed #235380
intel macos
build_macos_intel_37

00:12:51

84.0%
passed #235381
intel macos
build_macos_intel_38

00:12:50

84.0%