Fixed the index.rst to match joint docs requirements

4 jobs for index_fix in 34 minutes and 8 seconds (queued for 59 seconds)
Status Job ID Name Coverage
  Build
passed #124063
docker
build_linux_27

00:34:08

72.0%
passed #124064
docker
build_linux_36

00:29:38

72.0%
passed #124065
macosx
build_macosx_27

00:21:28

72.0%
passed #124066
macosx
build_macosx_36

00:26:07

72.0%