Misc. ./samples typos

Found via `codespell -q 3 --skip="./3rdparty" -I ../opencv-whitelist.txt`

samples/cpp/travelsalesman.cpp

@@ -16,9 +16,9 @@ public:
     {
         rng = theRNG();
     }
-    /** Give energy value for  a state of system.*/
+    /** Give energy value for a state of system.*/
     double energy() const;
-    /** Function which change the state of system (random pertubation).*/
+    /** Function which change the state of system (random perturbation).*/
     void changeState();
     /** Function to reverse to the previous state.*/
     void reverseState();