typo: correct the if else in the get example (#10950)

docs/platforms/python/tracing/instrumentation/custom-instrumentation/caches-module.mdx

@@ -89,7 +89,7 @@ with sentry_sdk.start_span(op="cache.get") as span:
 
         # Optionally also add the size of the value you retrieved
         span.set_data("cache.item_size", len(value))
-    else
+    else:
         # If you could not retrieve a value, it was a miss
         span.set_data("cache.hit", False)
 ```