Fixed erros in subscripts

[rsobt]

The subscripts in the commentary were different from the subscripts in the paper that was supposed to be cited.

In the text, "\textbf{X}_N" is used, but I think "\textbf{X}_M" is correct.

notebook : lab2.ipynb
section : Monte Carlo methods for option pricing
body :
Generate a large number, $M$, of random values which can serve as price paths ${\textbf{X}_1, \textbf{X}_2, . . . , \textbf{X}_N} $ for the underlying asset. These random values should be drawn from the probability distribution implied by the stochastic process. Let's call this distribution $\mathbb{P}$.

source :
Option Pricing Using Quantum Computers
https://arxiv.org/abs/1905.02666

It would be helpful if you could check it out.

Thank you.

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