add label for AuraDB Business Critical

Author: fiquick

Diff for: preview-src/labels.adoc

@@ -34,6 +34,10 @@
   <span class="label label--enterprise-only">Enterprise Only</span>
 </div>
 
+<div class="box">
+  <span class="label label--aura-db-business-critical">AuraDB Business Critical</span>
+</div>
+
 <div class="box">
   <span class="label label--aura">Aura</span>
 </div>