docs: fix contract verification url

[itsacoyote]

Description

The urls referenced for contract verification are incorrect. This fixes them with the zk parser tag that has the correct URL defined for both testnet and mainnet. These were added in https://github.com/matter-labs/docs-nuxt-template/pull/56

Linked Issues

Resolves #135

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 3d62709):

https://zksync-docs-staging-5eb09--pr142-135-feedback-verifyu-h3mo200s.web.app

_{(expires Wed, 03 Jul 2024 17:40:01 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: bfaafba5fa82d4f63473aaa76a21fabf1fbb3a11}

[github-actions[bot]]

:tada: This PR is included in version 1.6.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: