[#14602] laplace_transform() does not validate negative s_value despite documented non-negative requirement

### Feature description ### Description The `laplace_transform()` function documentation says that `s_value` must be non-negative, but the implementation currently does not validate this condition. Because of this, users can pass a negative `s_value`, even though the function docstring states that only real-valued, non-negative Laplace parameters are supported. ### File `maths/laplace_transformation.py` ### Relevant lines Around line 17–18, the docstring says: ```python This implementation supports only real-valued, non-negative Laplace parameters `s`.