Update instructions

src/samplesrc/maze.pla

@@ -442,7 +442,8 @@ fin
 if ^arg
     *rndnum = atoi(arg)
 else
-    puts("I, J, K, M to move. Q to quit.\n")
+    puts("I, J, K, M or arrow keys to move.\n")
+    puts("Q to quit.\n")
     puts("Add seed value to command line to replay maze.\n")
     puts("Press a key to generate the maze...")
     while not conio:keypressed()