Use absolute import in doctest

Author: jessegrabowski

pymc_experimental/inference/laplace.py

@@ -485,7 +485,7 @@ def fit_laplace(
 
     Examples
     --------
-    >>> from inference.laplace import fit_laplace
+    >>> from pymc_experimental.inference.laplace import fit_laplace
     >>> import numpy as np
     >>> import pymc as pm
     >>> import arviz as az