Fixed reference to image

Author: nastasha-solomon

docs/serverless/investigate/cases-settings.asciidoc

@@ -140,7 +140,7 @@ Create custom observable types for enhanced case collaboration.
 NOTE: You can create up to 10 custom observable types.
 
 [role="screenshot"]
-image::images/security-cases-observable-types.png[Add an observable type in case settings]
+image::images/cases-settings/security-cases-observable-types.png[Add an observable type in case settings]
 
 . In the *Observable types* section, click *Add observable*.
 . Enter a label for the observable type, then click *Save*.