Fix weights for MeanIndexCombinationStrategy (#74)

Author: vhaldemar

src/yandex_cloud_ml_sdk/_search_indexes/combination_strategy.py

@@ -73,7 +73,7 @@ def _to_proto(self) -> ProtoCombinationStrategy:
         if self.mean_evaluation_technique:
             kwargs['mean_evaluation_technique'] = int(self.mean_evaluation_technique)
         if self.weights is not None:
-            kwargs['weghts'] = tuple(self.weights)
+            kwargs['weights'] = tuple(self.weights)
 
         return ProtoCombinationStrategy(
             mean_combination=ProtoMeanCombinationStrategy(**kwargs)