Feat: updated pinocchio escrow challenge

Author: L0STE

src/app/content/challenges/pinocchio-escrow/en/pages/conclusion.mdx

@@ -18,7 +18,7 @@ Below are the accounts the context needs:
 - system_program: the system program. Must be executable
 - token_program: the token program. Must be executable
 
-**Note**: We're going to use the types that introduced in the [Introduction to Pinocchio](/en/courses/introduction-to-pinocchio/pinocchio-accounts).
+**Note**: We're going to use the helpers that we introduced in the [Introduction to Pinocchio](/en/courses/introduction-to-pinocchio/pinocchio-accounts).
 
 In code, this looks like: