pre-existing typo

Author: v-dirichards

articles/event-hubs/includes/event-hubs-tier-features.md

@@ -22,7 +22,7 @@ The following table shows the list of features that are available (or not availa
 | Dynamic Partition scale out | N/A | N/A | Yes | Yes |
 | Ingress events | Pay per million events | Pay per million events | Included | Included |
 | Runtime audit logs | N/A | N/A | Yes | Yes |
-| Availablity Zone | Yes | Yes | Yes | Yes |
+| Availability Zone | Yes | Yes | Yes | Yes |
 | Geo disaster | N/A | Yes | Yes | Yes |
 | IP Firewall | N/A | Yes | Yes | Yes |