DOC: Improve reshape\concat

Author: anetakahle

pandas/core/reshape/concat.py

@@ -173,7 +173,6 @@ def concat(
         they are all None in which case a ValueError will be raised.
     axis : {0/'index', 1/'columns'}, default 0
         The axis to concatenate along.
-        If 0, the outcome is identical to :meth:`DataFrame.append`.
     join : {'inner', 'outer'}, default 'outer'
         How to handle indexes on other axis (or axes).
     ignore_index : bool, default False