Removed tech preview prereq

Author: Michael Burke

modules/create-a-containerruntimeconfig-crd.adoc

@@ -103,15 +103,6 @@ spec:
 	set to a positive number, it must be at least 8192.
 <6> Optional: Specifies the container runtime to deploy to new containers. The default is `runc`.
 
-.Prerequisite
-
-* To enable crun, you must enable the `TechPreviewNoUpgrade` feature set.
-+
-[NOTE]
-====
-Enabling the `TechPreviewNoUpgrade` feature set cannot be undone and prevents minor version updates. These feature sets are not recommended on production clusters.
-====
-
 .Procedure
 
 To change CRI-O settings using the `ContainerRuntimeConfig` CR: