OSDOCS Add TP note for control plane boot image update

Author: Michael Burke

nodes/nodes/nodes-update-boot-images.adoc

@@ -12,6 +12,9 @@ include::snippets/mco-update-boot-images-abstract.adoc[]
 
 include::snippets/mco-update-boot-images-intro.adoc[]
 
+:FeatureName: Boot image management for control plane nodes
+include::snippets/technology-preview.adoc[]
+
 include::modules/mco-update-boot-images-about.adoc[leveloffset=+1]
 
 include::modules/mco-update-boot-images-disable.adoc[leveloffset=+1]