Typo Triumph: Documentation Defies Confusion with Correct RPC URL Syntax!

A shocking revision flies to the rescue, uniting users and software with precise command clarity!

Commit Details:

docs: Fix typo in ETH-mainnet-RPC-url flag Update install.md (#2499) ## Why is this change needed? I noticed a inconsistency in the documentation. The flag `--eth-mainnet-rpc-url` uses a hyphen in `ETH-mainnet-RPC-URL`, while the correct format (as seen in the `.env` file and other parts of the docs) uses underscores: `ETH_MAINNET_RPC_URL`. ## Merge Checklist - [x] PR title adheres to the [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/) standard - [x] PR has a [changeset](https://github.com/farcasterxyz/hub-monorepo/blob/main/CONTRIBUTING.md#35-adding-changesets) - [x] PR has been tagged with a change label(s) (i.e. documentation, feature, bugfix, or chore) - [x] PR includes [documentation](https://github.com/farcasterxyz/hub-monorepo/blob/main/CONTRIBUTING.md#32-writing-docs) if necessary. <!-- start pr-codex --> --- ## PR-Codex overview This PR focuses on updating the command syntax in the installation instructions for improved clarity by changing the placeholder format for the Ethereum and Optimism RPC URLs. ### Detailed summary - Updated the command in `install.md` from: - `yarn start --eth-mainnet-rpc-url <your ETH-mainnet-RPC-URL> --l2-rpc-url <your Optimism-L2-RPC-URL> --hub-operator-fid <your FID>` - To: - `yarn start --eth-mainnet-rpc-url <your_ETH_MAINNET_RPC_URL> --l2-rpc-url <your_Optimism_L2_RPC_URL> --hub-operator-fid <your_FID>` > ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your question}` <!-- end pr-codex -->