docs

docs/how_it_works.md

@@ -266,7 +266,6 @@ In order to tell whether an aggregation is simple, Narwhals uses the private `_d
 ```python exec="1" result="python" session="pandas_impl" source="above"
 print(pn.col("a").mean())
 print((pn.col("a") + 1).mean())
-print(pn.mean("a"))
 ```
 
 For simple aggregations, Narwhals can just look at `_depth` and `function_name` and figure out