docs: declare chain variable and import abstractTestnet

[jeffbrownn]

Added import abstractTestnet from viem/chains:

import { abstractTestnet } from 'viem/chains';

since:

• this import is present in viem/chains (verified)
• this import is used in other examples (AbstractWalletProvider, deployContract, createSessionClient etc)

In the Quick Start example, the chain variable is used inside the createAbstractClient call:

const abstractClient = await createAbstractClient({
  signer,
  chain,
  ...
});

However, the chain variable is not declared anywhere, so after importing it, I added it as follows:

const chain = abstractTestnet;

---

PR-Codex overview

This PR focuses on integrating the abstractTestnet from the viem/chains package into the existing code, enhancing the functionality of the client by allowing it to utilize this specific testnet.

Detailed summary

• Added import for abstractTestnet from viem/chains.
• Introduced a const chain = abstractTestnet; to utilize the testnet.
• Adjusted the documentation section to ensure proper formatting at the end of the file.

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[cursor]

PR Summary

Low Risk
Documentation-only changes that adjust example imports/variables and formatting; no runtime code paths are affected.

Overview
Fixes the @abstract-foundation/agw-client Quick Start README example by importing abstractTestnet from viem/chains and explicitly defining const chain = abstractTestnet before calling createAbstractClient.

Cleans up the Documentation section formatting (ensures the final link line is properly rendered/terminated).

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