OP: update RPM install instructions to remove CentOS and Red Hat (#2255)

Author: dwdougherty

content/operate/oss_and_stack/install/install-stack/rpm.md

@@ -10,7 +10,7 @@ title: Install Redis Open Source on Linux
 weight: 3
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-## Install Redis Open Source on Red Hat, CentOS, or Rocky Linux using RPM
+## Install Redis Open Source on Rocky Linux 8 and 9, or AlmaLinux 8 and 9 using RPM
 
 Follow these steps to install Redis Open Source.