Document default `turbo`

pysr/sr.py

@@ -480,6 +480,7 @@ class PySRRegressor(MultiOutputMixin, RegressorMixin, BaseEstimator):
         (Experimental) Whether to use LoopVectorization.jl to speed up the
         search evaluation. Certain operators may not be supported.
         Does not support 16-bit precision floats.
+        Default is `False`.
     precision : int
         What precision to use for the data. By default this is `32`
         (float32), but you can select `64` or `16` as well, giving