chore: update docs regarding new hardhat-zksync-node properties

[kiriyaga-txfusion]

Description

Update the documentation page for the hardhat-zksync-node plugin to include the new zksyncAnvil object in the Hardhat config file.

  zksyncAnvil: {
        version: '0.3.*', // optional.
        binaryPath: 'zksync/target/release/anvil-zksync', // optional
    },

• version is the anvil-zksync version. The default version is 0.3.*,
  which resolves to the latest patch version for the specified minor and major version.
  Available options include latest, a specific version, or a version with * as the patch to get the latest patch for a given major and minor version.
• binaryPath is binary path to anvil-zksync downloaded locally. If this property is set, it will take priority over the version property.

Linked Issues

Additional context

[popzxc]

IMHO a preface text is missing here, e.g.:

It's possible to configure the plugin to use a certain version of `anvil-zksync`.
To do that, add the following to the `hardhat.config.ts`: