[sphinx] Fixing warning (I hate those)

12 jobs for fix-issue-10 in 7 minutes and 59 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #87861
conda-linux
build_linux_27

00:02:15

passed #87862
conda-linux
build_linux_35

00:02:39

passed #87863
conda-linux
build_linux_36

00:02:42

passed #87864
conda-macosx
build_macosx_27

00:04:07

passed #87865
conda-macosx
build_macosx_35

00:03:59

passed #87866
conda-macosx
build_macosx_36

00:03:58

 
  Test
passed #87867
conda-linux
test_linux_27

00:02:19

passed #87868
conda-linux
test_linux_35

00:02:45

passed #87869
conda-linux
test_linux_36

00:02:43

passed #87870
conda-macosx
test_macosx_27

00:03:40

passed #87871
conda-macosx
test_macosx_35

00:03:35

passed #87872
conda-macosx
test_macosx_36

00:03:33