Reference in exercise out of order in scipy.rst

[natashawatkins]

The exercise in the SciPy lecture states that previously recursive functions were covered - this content now appears after the SciPy lecture

https://lectures.quantecon.org/py/scipy.html#Exercises

[natashawatkins]

I think maybe we should replace this exercise with something that uses the SciPy library...

[bayeswhu]

Hi @natashawatkins ,

I am teaching a class of quantitative econ, so find another exercise is out of order too.
Beside what you have mentioned, the exercise3 of numpy is related to python-oop, which is after numpy lecture now.

My solution is to modify the jupyter notebook version manually and move the exercise to the right section. I believe you may be too busy to deal with them.

If you can fix it by giving more exercise, that will be really helpful.