Merge "Update distros on the docs start page"

Author: Zuul

doc/source/index.rst

@@ -38,8 +38,7 @@ Install Linux
 
 Start with a clean and minimal install of a Linux system. DevStack
 attempts to support the two latest LTS releases of Ubuntu, the
-latest/current Fedora version, CentOS/RHEL 7, as well as Debian and
-OpenSUSE.
+latest/current Fedora version, CentOS/RHEL 8 and OpenSUSE.
 
 If you do not have a preference, Ubuntu 18.04 (Bionic Beaver) is the
 most tested, and will probably go the smoothest.