fix: cache_spans are False by default (#9245)

Correct the issue in the docs which state that `cache_spans` is enabled by defaults. This is not the case, it's actually disabled by default.

Author: garyj

docs/platforms/python/integrations/django/index.mdx

@@ -128,9 +128,9 @@ You can pass the following keyword arguments to `DjangoIntegration()`:
 
 - `cache_spans`:
 
-  Create spans and track performance of all read operations to configured caches. The spans also include information if the cache access was a hit or a miss. Set to `False` to disable.
+  Create spans and track performance of all read operations to configured caches. The spans also include information if the cache access was a hit or a miss. Set to `True` to enable.
 
-  The default is `True`.
+  The default is `False`.
 
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