Update fee mechanism link (#2901)

<!-- Reference any GitHub issues resolved by this PR -->

Closes #

## Introduced changes

<!-- A brief description of the changes -->

-

## 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`

Author: cptartur

docs/src/testing/gas-and-resource-estimation.md

@@ -3,7 +3,7 @@
 `snforge` supports gas and other VM resources estimation for each individual test case. 
 
 It does not calculate the final transaction fee, for details on how fees are calculated, 
-please refer to fee mechanism in [Starknet documentation](https://docs.starknet.io/documentation/architecture_and_concepts/Network_Architecture/fee-mechanism).
+please refer to fee mechanism in [Starknet documentation](https://docs.starknet.io/architecture-and-concepts/network-architecture/fee-mechanism).
 
 ## Gas Estimation
 
@@ -27,7 +27,7 @@ While using the fuzzing feature additional gas statistics will be displayed:
 > 📝 **Note**
 >  
 > Starknet-Foundry uses blob-based gas calculation formula in order to calculate gas usage. 
-> For details on the exact formula, [see the docs](https://docs.starknet.io/documentation/architecture_and_concepts/Network_Architecture/fee-mechanism/#overall_fee_blob). 
+> For details on the exact formula, [see the docs](https://docs.starknet.io/architecture-and-concepts/network-architecture/fee-mechanism/#overall_fee_blob). 
 
 ## VM Resources estimation