docs: fix broken link (#3342)

## Introduced changes

fixed broken link

-

## Checklist

<!-- Make sure all of these are complete -->

- [ ] Linked relevant issue
- [ ] Updated relevant documentation
- [ ] Added relevant tests
- [ ] Performed self-review of the code
- [ ] Added changes to `CHANGELOG.md`

---------

Co-authored-by: Artur Michałek <[email protected]>

Author: GarmashAlex

crates/sncast/README.md

@@ -23,7 +23,7 @@ You can download latest version of `sncast` [here](https://github.com/foundry-rs
 
 ## Documentation
 
-For more details on Starknet Foundry `sncast`, please visit [our docs](https://foundry-rs.github.io/starknet-foundry/starknet/index.html) 
+For more details on Starknet Foundry `sncast`, please visit [our docs](https://foundry-rs.github.io/starknet-foundry/starknet/sncast-overview.html) 
 
 ## Example usages