simple_neural_network.py: Fewer forward propogations to speed tests

Closes #9718

Author: cclauss

neural_network/simple_neural_network.py

@@ -28,7 +28,7 @@ def sigmoid_function(value: float, deriv: bool = False) -> float:
 def forward_propagation(expected: int, number_propagations: int) -> float:
     """Return the value found after the forward propagation training.
 
-    >>> res = forward_propagation(32, 10000000)
+    >>> res = forward_propagation(32, 100_000)  # Was 10_000_000
     >>> res > 31 and res < 33
     True