note that order is indeed preservedd

Author: MarcoGorelli

spec/API_specification/dataframe_api/dataframe_object.py

@@ -254,7 +254,7 @@ def concat(self, other: Sequence[DataFrame]) -> DataFrame:
         Notes
         -----
         The order in which the input DataFrames appear in
-        the output is not guaranteed and may vary across implementations.
+        the output is preserved.
 
         Returns
         -------