DOC Fix: require n_splits > 1 in TimeSeriesSplit
@@ -714,7 +714,7 @@ class TimeSeriesSplit(_BaseKFold):
Parameters
----------
n_splits : int, default=3
- Number of splits. Must be at least 1.
+ Number of splits. Must be at least 2.
.. versionchanged:: 0.20
``n_splits`` default value will change from 3 to 5 in v0.22.
