Broken Link to Anvil Documentation

[emrea-works]

At the foundry-rs/hardhat page, Anvil documentation link sends to 404.

Documentation

Foundry repo
Foundry book
Anvil

Instead, that URL seems like the right place:

https://github.com/foundry-rs/hardhat/blob/develop/packages/hardhat-anvil/README.md

or

https://github.com/foundry-rs/foundry/tree/master/crates/anvil