fix: import to Quantity class (#441)

Author: SMoraisAnsys

examples/low_frequency/motor/aedt_motor/pm_synchronous.py

@@ -20,7 +20,7 @@
 import matplotlib.pyplot as plt
 from ansys.aedt.core.examples.downloads import download_leaf
 from ansys.aedt.core.generic.constants import unit_converter
-from ansys.aedt.core.generic.numbers import Quantity
+from ansys.aedt.core.generic.numbers_utils import Quantity
 
 # -