Update diagram in inference doc (#3945)

The NJS model extraction module isn't needed at this time, so the diagram needs to be updated.

Author: sjberman

docs/proposals/gateway-inference-extension.md

@@ -76,20 +76,18 @@ flowchart TD
   A[Client Request] --> B[NGINX]
   subgraph NGINX Pod
     subgraph NGINX Container
-      B --1--> C[NJS Module: extract model name if needed]
-      C --2--> B
-      B --3--> D[NJS Module: Subrequest to Go App]
+      B --1--> C[NJS Module: Subrequest to Go App]
     end
     subgraph Go Application Container
-      E[Go Application]
+      D[Go Application]
     end
-    D -- 4. subrequest --> E
+    C -- 2. subrequest --> D
   end
-  E -- 5. gRPC ext_proc protocol --> F[Endpoint Picker Pod]
-  F -- 6. Endpoint in Header --> E
-  E --7--> D
-  D --8--> B
-  B --9--> G[AI Workload Endpoint]
+  D -- 3. gRPC ext_proc protocol --> E[Endpoint Picker Pod]
+  E -- 4. Endpoint in Header --> D
+  D --5--> C
+  C --6--> B
+  B --7--> F[AI Workload Endpoint]
 ```
 
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