[doc] Fix build instructions for documentation

15 jobs for master in 14 minutes and 55 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed build_linux_27 #6415
conda-linux

00:00:28

passed build_linux_34 #6416
conda-linux

00:00:36

passed build_linux_35 #6417
conda-linux

00:00:34

passed build_macosx_27 #6418
conda-macosx

00:02:06

passed build_macosx_34 #6419
conda-macosx

00:02:29

passed build_macosx_35 #6420
conda-macosx

00:01:44

 
  Test
passed test_linux_27 #6427
conda-linux

00:00:42

54.0%
passed test_linux_34 #6428
conda-linux

00:00:46

54.0%
passed test_linux_35 #6429
conda-linux

00:00:43

54.0%
passed test_macosx_27 #6430
conda-macosx

00:01:22

54.0%
passed test_macosx_34 #6431
conda-macosx

00:01:34

54.0%
passed test_macosx_35 #6432
conda-macosx

00:01:44

54.0%
 
  Docs
passed docs_linux_35 #6445
conda-linux

00:00:03

 
  Wheels
passed wheels_linux_27 #6446
conda-linux

00:00:02

passed wheels_linux_35 #6447
conda-linux

00:00:02