Fix docstring of test_request_context
diff --git a/src/flask/app.py b/src/flask/app.py
index db442c9edf..ce4dcf6a7d 100644
--- a/src/flask/app.py
+++ b/src/flask/app.py
@@ -2448,7 +2448,7 @@ def test_request_context(self, *args: t.Any, **kwargs: t.Any) -> RequestContext:
         :data:`request` point at the request for the created
         environment. ::
 
-            with test_request_context(...):
+            with app.test_request_context(...):
                 generate_report()
 
         When using the shell, it may be easier to push and pop the

Add missing `app.`.

