Minor docs change

docs/architecture-hld.md

@@ -67,7 +67,7 @@ flowchart TB
 
     Git --> Actions
     Actions --> Registry
-    Argo --> GKE
+    Argo ----> GKE
 ```
 
 ## Blue-Green Deployment Flow
@@ -103,7 +103,7 @@ flowchart LR
 ## Network Security Layers
 
 ```mermaid
-flowchart TD
+flowchart LR
     Internet((Internet)) --> FW[VPC Firewall<br/>Default deny]
     FW --> LB[Load Balancer<br/>HTTPS only]
     LB --> NP[K8s Network Policies]