[catboost] Fix eval_metric docs from util
Note: mandatory check (NEED_CHECK) was skipped
@@ -74,8 +74,8 @@ def eval_metric(label, approx, metric, weight=None, group_id=None, thread_count=
approx : list or numpy.arrays or pandas.DataFrame or pandas.Series
Object approxes.
- metrics : list of strings
- List of eval metrics.
+ metric : string
+ Metric name.
weight : list or numpy.array or pandas.DataFrame or pandas.Series, optional (default=None)
Object weights.
