Update manage-cost-storage.md

Updating some details of ASC billing
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cc: @bwren

Author: DaleKoetke

articles/azure-monitor/logs/manage-cost-storage.md

@@ -162,7 +162,7 @@ None of the legacy pricing tiers have regional-based pricing.
 
 ## Log Analytics and Azure Defender (Security Center)
 
-[Azure Defender (Security Center)](../../security-center/index.yml) billing is closely tied to Log Analytics billing. Azure Defender provides 500 MB/node/day allocation against the following subset of [security data types](/azure/azure-monitor/reference/tables/tables-category#security) (WindowsEvent, SecurityAlert, SecurityBaseline, SecurityBaselineSummary, SecurityDetection, SecurityEvent, WindowsFirewall, MaliciousIPCommunication, LinuxAuditLog, SysmonEvent, ProtectionStatus) and the Update and UpdateSummary data types when the Update Management solution isn't running on the workspace or solution targeting is enabled ([learn more](../../security-center/security-center-pricing.md#what-data-types-are-included-in-the-500-mb-data-daily-allowance)). If the workspace is in the legacy Per Node pricing tier, the Azure Defender and Log Analytics allocations are combined and applied jointly to all billable ingested data.  
+[Azure Defender for Servers (Security Center)](../../security-center/index.yml) billing is closely tied to Log Analytics billing. Azure Defender [bills by the number of monitored services](https://azure.microsoft.com/pricing/details/azure-defender/) and provides 500 MB/server/day data allocation that is applied to the following subset of [security data types](/azure/azure-monitor/reference/tables/tables-category#security) (WindowsEvent, SecurityAlert, SecurityBaseline, SecurityBaselineSummary, SecurityDetection, SecurityEvent, WindowsFirewall, MaliciousIPCommunication, LinuxAuditLog, SysmonEvent, ProtectionStatus) and the Update and UpdateSummary data types when the Update Management solution isn't running on the workspace or solution targeting is enabled ([learn more](../../security-center/security-center-pricing.md#what-data-types-are-included-in-the-500-mb-data-daily-allowance)). The count of monitored servers is calculated on an hourly granularity. The daily data allocation contributions from each monitored server are aggregated at the workspace level. If the workspace is in the legacy Per Node pricing tier, the Azure Defender and Log Analytics allocations are combined and applied jointly to all billable ingested data.  
 
 ## Change the data retention period