fixes broken image ref and updates model recommendation

Author: benironside

docs/serverless/AI-for-security/attack-discovery.mdx

@@ -34,7 +34,7 @@ When you access Attack discovery for the first time, you'll need to select an LL
 2. Select an existing connector from the dropdown menu, or add a new one. 
 
 <DocCallOut title="Recommended models">
-While Attack discovery is compatible with many different models, our testing found increased performance with Claude 3 Sonnet and Claude 3 Opus. In general, models with larger context windows are more effective for Attack discovery.
+While Attack discovery is compatible with many different models, our testing found increased performance with Claude 3 Sonnet. In general, models with larger context windows are more effective for Attack discovery.
 </DocCallOut>
 
 ![Attack discovery empty state](../images/attack-discovery/attck-disc-select-model-empty-state.png)