Fix docs on py27 following changes to the list class

12 jobs for doc_py27 in 10 minutes and 5 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #64534
conda-linux
build_linux_27

00:04:05

passed #64536
conda-linux
build_linux_34

00:05:59

passed #64538
conda-linux
build_linux_35

00:04:50

passed #64539
conda-macosx
build_macosx_27

00:03:23

passed #64537
conda-macosx
build_macosx_34

00:03:58

passed #64535
conda-macosx
build_macosx_35

00:03:05

 
  Test
passed #64544
conda-linux
test_linux_27

00:03:38

85.0%
passed #64542
conda-linux
test_linux_34

00:04:05

92.0%
passed #64540
conda-linux
test_linux_35

00:03:39

85.0%
passed #64541
conda-macosx
test_macosx_27

00:02:52

85.0%
passed #64543
conda-macosx
test_macosx_34

00:03:00

92.0%
passed #64545
conda-macosx
test_macosx_35

00:02:51

85.0%