fix(docs): deprecated alchemyapi.io domain in Scaffold-ETH 2 example in ethereum-tooling

[Sertug17]

Bug Report

docs/ethereum-tooling.mdx contains a deprecated Alchemy domain in a Scaffold-ETH 2 fallback URL, while the Sepolia fallback in the same code block already uses the current domain.

Affected File

docs/ethereum-tooling.mdx line 462

Problem

Current:

url: process.env.CHAINSTACK_MAINNET_ENDPOINT || `https://eth-mainnet.alchemyapi.io/v2/${providerApiKey}`,

alchemyapi.io is Alchemy's deprecated legacy domain. Requests to it redirect or fail. The Sepolia fallback in the same code block already uses the correct domain:

url: process.env.CHAINSTACK_DEVNET_ENDPOINT || `https://eth-sepolia.g.alchemy.com/v2/${providerApiKey}`,

Suggested Fix

url: process.env.CHAINSTACK_MAINNET_ENDPOINT || `https://eth-mainnet.g.alchemy.com/v2/${providerApiKey}`,

Verification

Confirmed at line 462 of ethereum-tooling.mdx. Both domains appear in the same code block, making the inconsistency clear.

[akegaviar]

Fixed at source in #595 (superseding #592). Thanks for the report, @Sertug17!