Use broader description of RHEL and its derivatives

Use the precise name of Red Hat Enterprise Linux and refer to the
derivatives in the title rather than listing the derivatives.  Include the
names of key derivative operating systems in the body text so that search
engines continue to find them.

The Red Hat usage guidelines are very clear that they operating system is
named Red Hat Enterprise Linux and should not be referenced as "Red Hat".

content/doc/book/installing/linux.adoc

@@ -17,7 +17,7 @@ Jenkins installers are available for several Linux distributions.
 
 * <<Debian/Ubuntu>>
 * <<Fedora>>
-* <<red-hat-centos,Red Hat/Alma/Rocky>>
+* <<red-hat-centos,Red Hat Enterprise Linux and derivatives>>
 
 include::doc/book/installing/_installation_requirements.adoc[]
 
@@ -202,9 +202,9 @@ firewall-cmd --reload
 ====
 
 [#red-hat-centos]
-== Red Hat/Alma/Rocky
+== Red Hat Enterprise Linux and derivatives
 
-You can install Jenkins through `yum` on Red Hat Enterprise Linux, Alma Linux, Rocky Linux, Oracle Linux, and other Red Hat based distributions.
+You can install Jenkins through `yum` on Red Hat Enterprise Linux, AlmaLinux, Rocky Linux, Oracle Linux, CentOS, and other Red Hat based distributions.
 
 .How To Install Jenkins on Rocky Linux 9
 video::2-L0WohfsqY[youtube, width=640, height=360]