Update tutorial-iss.md

Author: ocots

docs/src/tutorial-iss.md

@@ -86,7 +86,7 @@ where $[t]~=  (x(t),p(t),u(x(t), p(t)))$.
 
 !!! note "Our goal"
 
-    Our goal is to solve this boundary value problem (BVP). Solving the BVP involves applying the Pontryagin Maximum Principle, which provides necessary conditions for optimality.
+    Our goal is to solve this boundary value problem (BVP), which is equivalent to solving the Pontryagin Maximum Principle (PMP), which provides necessary conditions for optimality.
 
 ## Shooting function