docs: Fix broken link to Azure Cost Management documentation

Author: asudbring

articles/virtual-network/virtual-network-cost-optimization.md

@@ -89,7 +89,7 @@ Network usage patterns change as workloads evolve. Set up continuous monitoring
 
 | Recommendation | Benefit |
 |---|---|
-| **Configure cost alerts** when Virtual Network spending approaches predefined budget thresholds using [Azure Cost Management](../cost-management-billing/). | Proactive notifications prevent budget overruns and enable timely adjustments to network architecture. You can respond to cost increases before they significantly impact other initiatives and maintain predictable network spending. |
+| **Configure cost alerts** when Virtual Network spending approaches predefined budget thresholds using [Azure Cost Management](/azure/cost-management-billing/). | Proactive notifications prevent budget overruns and enable timely adjustments to network architecture. You can respond to cost increases before they significantly impact other initiatives and maintain predictable network spending. |
 | **Monitor data transfer patterns** using Azure Monitor and Network Watcher to identify expensive cross-region or cross-VNet traffic. | Understanding actual traffic flows enables data-driven optimization decisions. You can identify opportunities to relocate workloads, implement caching, or optimize application communication patterns. To monitor traffic, see [What is Azure Network Watcher?](../network-watcher/network-watcher-monitoring-overview.md). |
 | **Conduct quarterly network topology reviews** to identify unused peering connections, oversized gateways, or unnecessary network services. | Regular reviews ensure network investments remain aligned with business requirements. You can decommission unused connections, right-size gateways based on actual usage, and identify consolidation opportunities. |
 | **Track network cost allocation** per workload or business unit to drive accountability and identify optimization opportunities. | Cost visibility by workload enables teams to understand their network impact and make informed decisions. You can implement chargebacks or showbacks to drive cost-conscious behavior and justify network optimization initiatives. |