fix zone pivot syntax

Author: dlepow

articles/reliability/reliability-api-management.md

@@ -213,6 +213,8 @@ This section explains how to configure availability zone support for your API Ma
 
 :::zone-end
 
+:::zone pivot="premium-classic, premium-v2"
+
 ### Capacity planning and management
 
 In a zone-down scenario, there's no guarantee that requests for more capacity in another availability zone succeed. The backfilling of lost units occurs on a best-effort basis. If you need guaranteed capacity when an availability zone fails, create and configure your API Management instance to account for losing a zone by taking all of the following actions:
@@ -239,6 +241,8 @@ This section describes what to expect when API Management instances are configur
 
     - *Rate limit counters*, if you use the rate limiting capabilities that API Management provides. Rate limit counters are asynchronously replicated between the availability zones that you select for the instance.
 
+:::zone-end
+
 :::zone pivot="premium-classic"
 
 ### Behavior during a zone failure