Add dnf and yum commands in "Installation" section (#33369)
Add dnf and yum commands in "Installation" section (#33369)

* Add dnf and yum commands in "Installation" section

Even though the command is very simple, it's good to be able to c&p it.
There were already commands for apt, emerge, pip, even direct installation
from git, so adding Fedora/RHEL/CentOS examples is reasonable.

Since yum is not installed by default on any supported Fedora releases
(F26 and F28 currently), recommend dnf.

* Tiny edit

thaim/ansible,thaim/ansible