[finite_markov] Modify wording (#151)

Co-authored-by: mmcky <[email protected]>

Author: oyamad

lectures/finite_markov.md

@@ -767,7 +767,7 @@ One option is to regard this as an eigenvector problem: a vector
 $\psi$ such that $\psi = \psi P$ is a left eigenvector associated
 with the unit eigenvalue $\lambda = 1$.
 
-A more stable and sophisticated algorithm is implemented in [QuantEcon.py](http://quantecon.org/quantecon-py).
+A stable and sophisticated algorithm specialized for stochastic matrices is implemented in [QuantEcon.py](http://quantecon.org/quantecon-py).
 
 This is the one we recommend you to use: