Fix typo in _search.py (scikit-learn#31046)

Author: he7d3r

sklearn/model_selection/_search.py

@@ -773,8 +773,8 @@ def _run_search(self, evaluate_candidates):
                 - an optional `cv` parameter which can be used to e.g.
                   evaluate candidates on different dataset splits, or
                   evaluate candidates on subsampled data (as done in the
-                  SucessiveHaling estimators). By default, the original `cv`
-                  parameter is used, and it is available as a private
+                  Successive Halving estimators). By default, the original
+                  `cv` parameter is used, and it is available as a private
                   `_checked_cv_orig` attribute.
                 - an optional `more_results` dict. Each key will be added to
                   the `cv_results_` attribute. Values should be lists of