Documentation: Missing catatonit install step for EL

[shunkica]

https://github.com/containers/podman.io/blame/7f0d60aac3023a545d707426e78901573c98208d/docs/installation.md#L379-L389

catatonit is mentioned as a runtime dependency in the build from source part only in the context of installing it on Fedora.

To install catatonit on EL9 derivatives a user must run:

dnf install catatonit --enablerepo=crb

I am guessing there is a similar requirement for EL8/EL7 derivatives.

This does not install catatonit:

sudo dnf -y builddep rpm/podman.spec --enablerepo=crb