[lp_intro] Update descriptions on `scipy.optimize.linprog`

[oyamad]

Similar issue as in QuantEcon/lecture-python.myst#461

(1)
In https://intro.quantecon.org/lp_intro.html#computation-using-scipy:

Inside it, Python first transforms the problem into standard form.

Is this really the case? (I don't know what dual revised simplex and interior-point method really do...)

(2)
In https://intro.quantecon.org/lp_intro.html#id5:
The numbers in "SciPy tells us that the best investment strategy is:..." do not seem to match those in the output of the code.