Fix documentation errors

12 jobs for issue_4 in 5 minutes and 7 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #36929
conda-linux
build_linux_27

00:00:59

passed #36931
conda-linux
build_linux_34

00:01:04

passed #36933
conda-linux
build_linux_35

00:01:06

passed #36934
conda-macosx
build_macosx_27

00:01:41

passed #36932
conda-macosx
build_macosx_34

00:01:38

passed #36930
conda-macosx
build_macosx_35

00:01:40

 
  Test
passed #36939
conda-linux
test_linux_27

00:01:51

67.0%
passed #36937
conda-linux
test_linux_34

00:01:54

67.0%
passed #36935
conda-linux
test_linux_35

00:01:52

67.0%
passed #36936
conda-macosx
test_macosx_27

00:03:19

67.0%
passed #36938
conda-macosx
test_macosx_34

00:03:15

67.0%
passed #36940
conda-macosx
test_macosx_35

00:03:16

67.0%