Mini: Notebook not formatted correctly

In the steady state solver explanation notebook, one math expression is wrong, leading to a long line `𝑤ℎ𝑒𝑟𝑒:𝑚𝑎𝑡ℎ:‘𝑥∗‘𝑑𝑒𝑛𝑜𝑡𝑒𝑠𝑡ℎ𝑒𝑠𝑡𝑒𝑎𝑑𝑦𝑠𝑡𝑎𝑡...` https://amici.readthedocs.io/en/latest/ExampleEquilibrationLogic.html