Update release-notes.md

Changing the link in June 11th RN to go to this page 
https://learn.microsoft.com/en-us/azure/migrate/concepts-business-case-calculation

(where security cost calculation is explained and the concept of business case is also explained)
instead of the general business case docs page.

Author: OzWilderMS

articles/defender-for-cloud/release-notes.md

@@ -111,7 +111,7 @@ For more information on compliance controls, see [Tutorial: Regulatory complianc
 
 June 11, 2023
 
-Now you can discover potential cost savings in security by applying Defender for Cloud within the context of an [Azure Migrate business case](/azure/migrate/how-to-build-a-business-case).
+Now you can discover potential cost savings in security by applying Defender for Cloud within the context of an [Azure Migrate business case](/azure/migrate/concepts-business-case-calculation).
 
 ### Express configuration for vulnerability assessments in Defender for SQL is now Generally Available