docs: fix a docs mistake (#640)

Author: badmonster0

docs/docs/core/flow_methods.mdx

@@ -81,7 +81,7 @@ The `update()` async method creates/updates data in the target.
 Once the function returns, the target data is fresh up to the moment when the function is called.
 
 ```python
-stats = await demo_flow.update()
+stats = demo_flow.update()
 print(stats)
 ```