fix link

Author: montyly

not-so-smart-contracts/cairo/README.md

@@ -17,7 +17,7 @@ Each _Not So Smart Contract_ consists of a standard set of information:
 | Not So Smart Contract                                                        | Description                                                  |
 | ---------------------------------------------------------------------------- | ------------------------------------------------------------ |
 | [Arithmetic overflow](arithmetic_overflow)                                   | Insecure arithmetic in Cairo for the felt252 type            |
-| [L1 to L2 Address Conversion](l1_to_l2_address_conversion)                   | Essential L2 address checks for L1 to L2 messaging           |
+| [L1 to L2 Address Conversion](L1_to_L2_address_conversion)                   | Essential L2 address checks for L1 to L2 messaging           |
 | [L1 to L2 message failure](l1_to_l2_message_failure)                         | Messages sent from L1 may not be processed by the sequencer  |
 | [Overconstrained L1 <-> L2 interaction](overconstrained_l1_l2_interaction)   | Asymmetrical checks on the L1 or L2 side can cause a DOS     |
 | [Signature replays](replay_protection)                                       | Necessary robust reuse protection due to account abstraction |