Remove code examples for Python 3.8 in `wsgi`

docs/en/docs/advanced/wsgi.md

@@ -12,7 +12,7 @@ Then wrap the WSGI (e.g. Flask) app with the middleware.
 
 And then mount that under a path.
 
-{* ../../docs_src/wsgi/tutorial001.py hl[2:3,3] *}
+{* ../../docs_src/wsgi/tutorial001_py39.py hl[2:3,3] *}
 
 ## Check it { #check-it }
 

tests/test_tutorial/test_wsgi/test_tutorial001.py

@@ -1,6 +1,6 @@
 from fastapi.testclient import TestClient
 
-from docs_src.wsgi.tutorial001 import app
+from docs_src.wsgi.tutorial001_py39 import app
 
 client = TestClient(app)