fix formatting for logreg cv (#3051)

Author: david-cortes-intel

doc/sources/preview.rst

@@ -89,6 +89,6 @@ Current list of preview estimators:
    * - :obj:`sklearn.decomposition.IncrementalPCA`
      - ``sklearnex.preview.decomposition``
      - Yes
-   * - LogisticRegressionCV
-     - sklearnex.preview.linear_model
+   * - :obj:`sklearn.linear_model.LogisticRegressionCV`
+     - ``sklearnex.preview.linear_model``
      - Yes