Docs: Change link title (#101043)

Update _index.md

Proposal to change the link title (also the relref behind, respectively).  At the sidebar, under: Set up > Install Grafana - there is a link with the title "RHEL or Fedora". Just to be uniform...

docs/sources/setup-grafana/installation/_index.md

@@ -32,7 +32,7 @@ Grafana relies on other open source software to operate. For a list of open sour
 Grafana supports the following operating systems:
 
 - [Debian or Ubuntu]({{< relref "./debian" >}})
-- [Red Hat, RHEL, or Fedora]({{< relref "./redhat-rhel-fedora" >}})
+- [RHEL or Fedora]({{< relref "./rhel-fedora" >}})
 - [SUSE or openSUSE]({{< relref "./suse-opensuse" >}})
 - [macOS]({{< relref "./mac" >}})
 - [Windows]({{< relref "./windows" >}})