Switch to math highlighting and update legostic regresion get doc since it doesn't throw an an error

Author: holdenk

python/pyspark/ml/classification.py

@@ -159,7 +159,7 @@ def getThreshold(self):
         """
         Gets the value of threshold or attempt to convert thresholds to threshold if set, or default
         value if neither are set.
-        This conversion is equivalent to: {{{1 / (1 + thresholds(0) / thresholds(1))}}}.
+        This conversion is equivalent to: :math:`\\frac{1}{1 + \\frac{thresholds(0)}{thresholds(1)}}`.
         """
         self._checkThresholdConsistency()
         if self.isSet(self.thresholds):
@@ -188,7 +188,7 @@ def getThresholds(self):
         If :py:attr:`thresholds` is set, return its value.
         Otherwise, if :py:attr:`threshold` is set, return the equivalent thresholds for binary
         classification: (1-threshold, threshold).
-        If neither are set, throw an error.
+        If neither are set, return the default value.
         """
         self._checkThresholdConsistency()
         if not self.isSet(self.thresholds) and self.isSet(self.threshold):