Fix docstring

theano/scalar/basic_scipy.py

@@ -88,7 +88,7 @@ erfc = Erfc(upgrade_to_float_no_complex, name='erfc')
 class Erfcx(UnaryScalarOp):
     """
     Implements the scaled complementary error function exp(x**2)*erfc(x) in a numerically stable way for large x. This
-    is useful for calculating things like log(erfc(x)) = log(erfcx(x)) - 2 * x without causing underflow. Should only
+    is useful for calculating things like log(erfc(x)) = log(erfcx(x)) - x ** 2 without causing underflow. Should only
     be used if x is known to be large and positive, as using erfcx(x) for large negative x may instead introduce
     overflow problems.