add thresholds cases-overview.md

Author: austinmccollum

unified-secops-platform/cases-overview.md

@@ -65,6 +65,8 @@ To start using case management, select **Cases** in the Defender portal to acces
 
 :::image type="content" source="media/cases-overview/cases-queue-view.png" alt-text="Screenshot of case queue.":::
 
+The maximum allowed per tenant is 100,000 cases.
+
 ## Case details
 
 Each case has a page which allows analysts to manage the case and displays important details.
@@ -112,6 +114,8 @@ Alternatively, if the IR team needs to escalate one or more incidents to the hun
 
 :::image type="content" source="media/cases-overview/link-incident-from-incident-graph.png" alt-text="Screenshot showing the link incident option from ellipses menu in the incident view.":::
 
+The threshold for linking is 100 incidents per case.
+
 ### Activity log
 
 Need to write down notes, or that key detection logic to pass along? Create plain text comments and review the audit events in the activity log. Comments are a great place to quickly add information to a case.