docs: Fix middleware_spans docstring (#5279)

We updated the option default, but forgot to update the docstring.

Author: sentrivana

sentry_sdk/integrations/django/__init__.py

@@ -109,7 +109,7 @@ class DjangoIntegration(Integration):
     Auto instrument a Django application.
 
     :param transaction_style: How to derive transaction names. Either `"function_name"` or `"url"`. Defaults to `"url"`.
-    :param middleware_spans: Whether to create spans for middleware. Defaults to `True`.
+    :param middleware_spans: Whether to create spans for middleware. Defaults to `False`.
     :param signals_spans: Whether to create spans for signals. Defaults to `True`.
     :param signals_denylist: A list of signals to ignore when creating spans.
     :param cache_spans: Whether to create spans for cache operations. Defaults to `False`.