Update config-network-adapters.md

Chart fix

Author: iRaindrop

docs/versioned/serving/config-network-adapters.md

@@ -47,14 +47,15 @@ The Knative `networking.internal.knative.dev` Ingress type is generally referred
       theme: default
     ---
     flowchart LR
-     subgraph bottom[" "]
+      subgraph bottom[" "]
         direction LR
             envoy["Envoy deployment<br>kourier-system namespace"]
             kourier["net-kourier<br>controller"]
             kingress2["KIngress<br>Class: kourier.ingress.networking.knative.dev"]
       end
         kingress2 -- read by --> kourier
         kourier -- programs --> envoy
+    
         style envoy fill:#BBDEFB
         style kourier fill:#FFE0B2
         style bottom fill:transparent