Fixed typo.

Vectors_of_Polynomials.py

@@ -68,5 +68,5 @@ class AlpertsWavelet(Vector):
                     0.5 * np.sqrt(7/158) * (32 - 315*eval_point + 960*(eval_point**2)
                                             - 1155*(eval_point**3) + 480*(eval_point**4))]
 
-        raise ValueError('Invalid value: Albert\'s wavelet is only available \
+        raise ValueError('Invalid value: Alpert\'s wavelet is only available \
                          up to degree 4 for this application')