[doc] Updates to the linux installation instructions

7 jobs for master in 11 minutes and 37 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed build_linux_36 #158087
docker

00:02:45

passed build_linux_37 #158076
docker

00:05:09

passed build_macosx_36 #158077
macosx

00:03:33

passed build_macosx_37 #158078
macosx

00:03:26

passed build_linux_36 #158080
docker

00:37:30

canceled build_linux_36 #158075
docker

00:01:31

 
  Deploy
passed deploy_beta #158079
docker

00:03:43