docs: make code snippet usable with required imports (#16473)
diff --git a/docs/src/pages/docs/installation/configuring.mdx b/docs/src/pages/docs/installation/configuring.mdx
index d7437f2..922f97d 100644
--- a/docs/src/pages/docs/installation/configuring.mdx
+++ b/docs/src/pages/docs/installation/configuring.mdx
@@ -207,7 +207,11 @@
the app object and can alter it in any way. For example, add `FLASK_APP_MUTATOR` into your
`superset_config.py` to setup session cookie expiration time to 24 hours:
-```
+```python
+from flask import session
+from flask import Flask
+
+
def make_session_permanent():
'''
Enable maxAge for the cookie 'session'
