Fix whitespace

Author: Pablo Osorio Lopez

machine_learning/linear_discriminant_analysis.py

@@ -250,7 +250,7 @@ def accuracy(actual_y: list, predicted_y: list) -> float:
 
 
 def valid_input(
-    input_type: Callable[[object], num], # Usually float or int
+    input_type: Callable[[object], num],  # Usually float or int
     input_msg: str,
     err_msg: str,
     condition: Callable[[num], bool] = lambda x: True,