Update customer-managed-keys.md

Added period to final bullet in line 58.

Author: PMEds28

articles/sentinel/customer-managed-keys.md

@@ -55,7 +55,7 @@ To provision CMK, follow these steps: 
 
 5.  Enable CMK in Azure Sentinel.
 
-6.  Enable Azure Sentinel
+6.  Enable Azure Sentinel.
 
 ### STEP 1: Create an Azure Key Vault and storing key