chore: fix link (#316)

# What ❔

- fix link 

## Why ❔

- The current link is inaccessible.

## Checklist

<!-- Check your PR fulfills the following items. -->
<!-- For draft PRs check the boxes as you complete them. -->

- [x] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [ ] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [x] Code has been formatted via `zk fmt` and `zk lint`.

docs/advanced/how_call_works.md

@@ -106,7 +106,7 @@ In this article, we covered the 'life of a call' from the RPC to the inner worki
 'out-of-circuit' VM with the bootloader.
 
 [namespaces_rpc_api]:
-  https://github.com/matter-labs/zksync-2-dev/blob/edd48fc37bdd58f9f9d85e27d684c01ef2cac8ae/core/bin/zksync_core/src/api_server/web3/backend_jsonrpc/namespaces/eth.rs
+  https://github.com/matter-labs/zksync-era/blob/edd48fc37bdd58f9f9d85e27d684c01ef2cac8ae/core/bin/zksync_core/src/api_server/web3/backend_jsonrpc/namespaces/eth.rs
   'namespaces RPC api'
 [namespaces_rpc_impl]:
   https://github.com/matter-labs/zksync-2-dev/blob/edd48fc37bdd58f9f9d85e27d684c01ef2cac8ae/core/bin/zksync_core/src/api_server/web3/namespaces/eth.rs#L94
@@ -118,7 +118,7 @@ In this article, we covered the 'life of a call' from the RPC to the inner worki
   https://github.com/matter-labs/zksync-2-dev/blob/dc3b3d6b055c558b0e1a76ef5de3184291489d9f/core/lib/vm/src/vm.rs#L544
   'vm code'
 [bootloader_code]:
-  https://github.com/matter-labs/system-contracts/blob/93a375ef6ccfe0181a248cb712c88a1babe1f119/bootloader/bootloader.yul
+  https://github.com/matter-labs/era-system-contracts/blob/93a375ef6ccfe0181a248cb712c88a1babe1f119/bootloader/bootloader.yul
   'bootloader code'
 [init_vm_inner]:
   https://github.com/matter-labs/zksync-2-dev/blob/dc3b3d6b055c558b0e1a76ef5de3184291489d9f/core/lib/vm/src/vm_with_bootloader.rs#L348