Merge pull request #36327 from xenolinux/bug1926142

BZ1926142: Add clarity for machine requirements

Author: sagidlow

modules/installation-requirements-user-infra.adoc

@@ -99,7 +99,7 @@ these cluster machines.
 endif::ibm-z[]
 ====
 
-The bootstrap and control plane machines must use {op-system-first} as the operating system.
+The bootstrap and control plane machines must use {op-system-first} as the operating system. However, the compute machines can choose between {op-system-first} or {op-system-base-full} 7.9.
 
 ifdef::bare-metal,agnostic[]
 [IMPORTANT]