what's new formatting fix

Author: ShashiSubramanya

modules/ROOT/pages/whats-new.adoc

@@ -291,10 +291,13 @@ You can now configure a xref:webhooks-lb-schedule.adoc[webhook for Liveboard sch
 This feature is currently in beta and is not enabled by default. To enable it on your instance, contact ThoughtSpot Support.
 ====
 
-=== Template variables for publishing
+.Template variables for publishing
+[%collapsible]
+====
 The variable APIs include several enhancements to streamline variable creation and update workflows.
 For information about the new enhancements and breaking changes, see xref:rest-apiv2-changelog.adoc#_variable_api_enhancements[REST API changelog] and xref:variables.adoc[Variables documentation].
 ====
+
 .Parameter chip visibility configuration [tag redBackground]#BREAKING CHANGE#
 [%collapsible]
 ====