OCPBUGS-36595: Add missing link to Installing Butane

Author: amolnar-rh

edge_computing/image_based_upgrade/preparing_for_image_based_upgrade/cnf-image-based-upgrade-shared-container-partition.adoc

@@ -12,3 +12,8 @@ You can do this at install time.
 include::modules/cnf-image-based-upgrade-shared-container-partition.adoc[leveloffset=+1]
 
 include::modules/ztp-image-based-upgrade-shared-container-partition.adoc[leveloffset=+1]
+
+[role="_additional-resources"]
+.Additional resources
+
+* xref:../../../installing/install_config/installing-customizing.adoc#installation-special-config-butane-install_installing-customizing[Installing Butane]

modules/ztp-image-based-upgrade-shared-container-partition.adoc

@@ -14,7 +14,7 @@ You must complete this procedure at installation time.
 
 .Prerequisites
 
-* Install Butane.
+* Install Butane. For more information, see "Installing Butane".
 
 .Procedure