Update cdk-pp-highlevel-arch.md

Author: mitchpolygon

docs/cdk/architecture/cdk-pp-highlevel-arch.md

@@ -1,6 +1,6 @@
 The figure below depicts a simplified, high-level view of the CDK chain architecture using pessimistic proofs and the flow of transactions through the system.
 
-![Figure: CDK Architecture](../../img/cdk/CDK-pessimistic-proof-chain.jpg)
+![Figure: CDK Architecture](../../img/cdk/Pessimistic-proofs-diagram.jpg)
 
 ## Transaction Flow