Enhance MonitoringPerformance_SplunkDelays.md with visuals

Added images and mermaid diagram to enhance monitoring performance documentation.

Author: brown9804

0_Azure/2_AzureAnalytics/2_EventHubs/demos/MonitoringPerformance_SplunkDelays.md

@@ -65,8 +65,12 @@ https://github.com/user-attachments/assets/2616c7fb-81b5-4365-9346-0332b91cc892
 | **Capture Backlog**    | Volume of data waiting to be written to storage (Blob/Data Lake).                     | If using Capture, a growing backlog signals Event Hubs is falling behind or storage is misconfigured.   |
 
 E.g 
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+<img width="1458" height="608" alt="image" src="https://github.com/user-attachments/assets/467e5fbb-895a-4950-b4ff-153b5e8e9fa6" />
+
 <img width="1898" height="845" alt="image" src="https://github.com/user-attachments/assets/f35c9c72-7491-42a0-8b40-87147ffadc7e" />
 
+
 ```mermaid
 graph TD
   A[Delay in Splunk ingestion]