chore: fix 404 status URL

Co-Authored-By: ZhengXingRu <[email protected]>

Author: wackerow

public/content/developers/docs/smart-contracts/testing/index.md

@@ -259,7 +259,7 @@ The major difference is that bug bounty programs are open to the wider developer
 
 - **[Brownie unit testing framework](https://eth-brownie.readthedocs.io/en/v1.0.0_a/tests.html)** - _Brownie utilizes Pytest, a feature-rich test framework that lets you write small tests with minimal code, scales well for large projects, and is highly extendable._
 
-- **[Foundry Tests](https://github.com/foundry-rs/foundry/tree/master/forge)** - _Foundry offers Forge, a fast and flexible Ethereum testing framework capable of executing simple unit tests, gas optimization checks, and contract fuzzing._
+- **[Foundry Tests](https://github.com/foundry-rs/foundry/tree/master/crates/forge)** - _Foundry offers Forge, a fast and flexible Ethereum testing framework capable of executing simple unit tests, gas optimization checks, and contract fuzzing._
 
 - **[Hardhat Tests](https://hardhat.org/hardhat-runner/docs/guides/test-contracts)** - _Framework for testing smart contracts based on ethers.js, Mocha, and Chai._