(AzureCXP) fixes MicrosoftDocs/azure-docs#359947

Added a new line no: 49
- **Auto-renew**: **On** or **Off**. The savings plan will automatically renew at the end of its term if it is **On**. By default, this option is set to **Off**.

Author: TPavanBalaji

articles/cost-management-billing/savings-plan/buy-savings-plan.md

@@ -46,6 +46,7 @@ After you buy a savings plan, you can [change the savings plan scope](manage-sav
         - The potential savings percentage compared to on-demand costs for the commitment.
         - The percentage of the selected scopes compute usage that is covered by the new savings plan. It includes the commitment amount plus any other previously purchased savings plan or reservation.
     - **Billing frequency**: **All upfront** or **Monthly**. The total cost of the savings plan is the same regardless of the selected frequency.
+    - **Auto-renew**: **On** or **Off**. The savings plan will automatically renew at the end of its term if it is **On**. By default, this option is set to **Off**.
 
 ### Purchase with the Savings Plan Order Alias - Create API