migrates QuantEcon/lecture-python-advanced#175 (#43)

Author: mmcky

lectures/markov_jump_lq.md

@@ -212,7 +212,7 @@ $$
   \\
   &
    \left[
-     x'R_i x + u' Q_i u + 2 u' W_i x -
+     x'R_i x + u' Q_i u + 2 u' W_i x +
              \beta \sum_j \Pi_{ij}E ((A_i x + B_i u + C_i w)' P_j
              (A_i x + B_i u + C_i w) x + \rho_j)
    \right]