Merge pull request #359 from crytic/fix-hevm-links

Fixes for hevm-related broken urls

Author: montyly

program-analysis/echidna/advanced/hevm-cheats-to-test-permit.md

@@ -8,7 +8,7 @@
 
 This method presents a new way of allocating allowances, as signatures can be computed off-chain and passed to a contract. It allows a relayer to pay the entire gas fee of the permit transaction in exchange for a fee, enabling completely gasless transactions for a user. Furthermore, this removes the typical `approve() -> transferFrom()` pattern that forces users to send two transactions instead of just one through this new method.
 
-Note that for the permit function to work, a valid signature is needed. This example will demonstrate how we can use [`hevm`'s `sign` cheatcode](https://github.com/dapphub/dapptools/blob/master/src/hevm/README.md#cheat-codes) to sign data with a private key. More generally, you can use this cheatcode to test anything that requires valid signatures.
+Note that for the permit function to work, a valid signature is needed. This example will demonstrate how we can use [`hevm`'s `sign` cheatcode](https://hevm.dev/ds-test-tutorial.html#supported-cheat-codes) to sign data with a private key. More generally, you can use this cheatcode to test anything that requires valid signatures.
 
 ## Example
 

program-analysis/echidna/advanced/on-using-cheat-codes.md

@@ -5,7 +5,7 @@
 - [How and when to use cheat codes](#how-and-when-to-use-cheat-codes)
   - [Introduction](#introduction)
   - [Cheat codes available in Echidna](#cheat-codes-available-in-echidna)
-  - [Advice on the use of cheat codes](#advice-on-the-use-of-cheat-codes)
+  - [Risks of cheat codes](#risks-of-cheat-codes)
 
 ## Introduction
 
@@ -14,7 +14,7 @@ Cheat codes are special functions that allow to change the state of the EVM in w
 
 ## Cheat codes available in Echidna
 
-Echidna supports all cheat codes that are available in [hevm](https://github.com/ethereum/hevm). These are documented here: https://hevm.dev/controlling-the-unit-testing-environment.html#cheat-codes.
+Echidna supports all cheat codes that are available in [hevm](https://github.com/ethereum/hevm). These are documented here: [https://hevm.dev/controlling-the-unit-testing-environment.html#cheat-codes](https://hevm.dev/ds-test-tutorial.html#supported-cheat-codes).
 If a new cheat code is added in the future, Echidna only needs to update the hevm version and everything should work out of the box.
 
 As an example, the `prank` cheat code is able to set the `msg.sender` address in the context of the next external call: