Merge pull request #7766 from camunda/fix-values-example-870-880

fix(upgrade-guide): Correct values example

Author: alexronquillo

docs/self-managed/deployment/helm/upgrade/helm-870-880.md

@@ -327,14 +327,15 @@ The Helm chart creates a dedicated Keycloak client with read-only access to your
 :::
 
 ```yaml
-migration:
-  identity:
-    enabled: true
-    secret:
-      existingSecret: identity-migration-secret
-      existingSecretKey: password
-    # Only required if resource authorizations are used
-    resourceAuthorizationsEnabled: true
+orchestration:
+  migration:
+    identity:
+      enabled: true
+      secret:
+        existingSecret: identity-migration-secret
+        existingSecretKey: password
+      # Only required if resource authorizations are used
+      resourceAuthorizationsEnabled: true
 ```
 
 3. Groups Migration: