fix final link

Author: austinmccollum

articles/sentinel/whats-new.md

@@ -30,7 +30,7 @@ The listed features were released in the last three months. For information abou
 
 Pre-purchase plans are a type of Azure reservation. When you buy a pre-purchase plan, you get commit units (CUs) at discounted tiers for a specific product. Microsoft Sentinel commit units (SCUs) apply towards eligible costs in your workspace. When you have predictable costs, choosing the right pre-purchase plan saves you money! 
 
-For more information, see [Optimize costs with a pre-purchase plan](billing-prepurchase-plan.md).
+For more information, see [Optimize costs with a pre-purchase plan](billing-pre-purchase-plan.md).
 
 ### Import/export of automation rules now generally available (GA)