Fix restoration example imports

doc/examples/plot_phase_unwrap.py

@@ -14,7 +14,7 @@ skimage. Here we will demonstrate phase unwrapping in the two dimensional case.
 import numpy as np
 from matplotlib import pyplot as plt
 from skimage import data, img_as_float, color, exposure
-from skimage.exposure import unwrap_phase
+from skimage.restoration import unwrap_phase
 
 
 # Load an image as a floating-point grayscale