DOC Add missing backquote in LogisticRegression docstring (#16106)

sklearn/linear_model/_logistic.py

@@ -1157,7 +1157,7 @@ class LogisticRegression(BaseEstimator, LinearClassifierMixin,
 
     l1_ratio : float, default=None
         The Elastic-Net mixing parameter, with ``0 <= l1_ratio <= 1``. Only
-        used if ``penalty='elasticnet'`. Setting ``l1_ratio=0`` is equivalent
+        used if ``penalty='elasticnet'``. Setting ``l1_ratio=0`` is equivalent
         to using ``penalty='l2'``, while setting ``l1_ratio=1`` is equivalent
         to using ``penalty='l1'``. For ``0 < l1_ratio <1``, the penalty is a
         combination of L1 and L2.