docs(apigw) - adding full example

Author: leandrodamascena

docs/core/event_handler/api_gateway.md

@@ -470,7 +470,7 @@ You can use specialized router classes according to the type of event that you a
 | ALBRouter               | ALBResolver               | ALBEvent               |
 | LambdaFunctionUrlRouter | LambdaFunctionUrlResolver | LambdaFunctionUrlEvent |
 
-```python hl_lines="3 9"
+```python hl_lines="1 5 9"
 --8<-- "examples/event_handler_rest/src/split_route_specialized_router.py"
 ```
 

examples/event_handler_rest/src/split_route_specialized_router.py

@@ -1,11 +1,20 @@
+from aws_lambda_powertools.event_handler import APIGatewayRestResolver
 from aws_lambda_powertools.event_handler.router import APIGatewayRouter
 
+app = APIGatewayRestResolver()
 router = APIGatewayRouter()
 
 
 @router.get("/me")
 def get_self():
     # router.current_event is a APIGatewayProxyEvent
-    principal_id = router.current_event.request_context.authorizer.principal_id
+    account_id = router.current_event.request_context.account_id
 
-    return {"principal_id": principal_id}
+    return {"account_id": account_id}
+
+
+app.include_router(router)
+
+
+def lambda_handler(event, context):
+    return app.resolve(event, context)