Update 05-implementation.md

documentation/design/05-implementation.md

@@ -60,7 +60,7 @@ graph TB
   Node1[Node 1] <--> Node2[Node 2] <--> Node3[Node 3]
   Node4[Node 4] <--> Node2[Node 2] <--> Node5[Node 5] 
 
-  Node2 --> SubGraph1[Link to G_logical1]
+  Net_physical[Net_physical] --> SubGraph1[Link to G_logical1]
   
 end
 ```