Update choosing-right-tier.md

Author: robece

articles/event-grid/choosing-right-tier.md

@@ -9,7 +9,7 @@ ms.date: 08/25/2023
 
 Azure Event Grid has two tiers with different capabilities. This article will share details on both. 
 
-## Standard Tier
+## Standard tier
 
 Offers:
 - Event Grid namespaces.
@@ -22,7 +22,7 @@ Use this tier:
 
 For more information, see quotas and limits for [namespaces](quotas-limits.md#namespace-resource-limits).
 
-## Basic Tier
+## Basic tier
 
 Offers:
 - Event Grid custom topics, Event Grid system topics, Event domains and Event Grid partner topics.