fix issue (#6881)

Co-authored-by: orizi <104711814+orizi@users.noreply.github.com>

corelib/src/dict.cairo

@@ -24,7 +24,7 @@
 //! assert!(dict.get(1) == 20);
 //!
 //! dict.insert(0, 20);
-//! assert!(dict.get(0) == 20
+//! assert!(dict.get(0) == 20);
 //! ```
 //!
 //! It is also possible to use the [`Felt252DictTrait::entry`] method to retrieve the last entry