docs: Add PAYG unlimited virtualization alternative to Linux passive billing FAQ

Author: MikeRayMSFT

docs/sql-server/azure-arc/faq.yml

@@ -77,7 +77,7 @@ sections:
 
       - question: Why are my passive SQL Server instances on Linux billed as active with pay-as-you-go?
         answer: |
-          Passive instance detection isn't available on Linux. Without this capability, the free passive billing benefit can't be applied. All instances are billed based on the OS-reported core count. If you need free passive instance billing, consider using volume licensing instead of PAYG.
+          Passive instance detection isn't available on Linux. Without this capability, the free passive billing benefit can't be applied. All instances are billed based on the OS-reported core count. If you need free passive instance billing, consider using volume licensing instead of PAYG, or use [PAYG physical cores with unlimited virtualization](manage-license-billing.md#unlimited-virtualization).
 
       - question: How does core detection work for PAYG on Linux?
         answer: |