Docs: update goerli deployment in README to use consistent address byte previews

See discussion here: https://github.com/Layr-Labs/eigenlayer-contracts/pull/328#discussion_r1393208064

TLDR: The Goerli deployment info in the README uses inconsistent number of bytes for the markdown "address preview" used to display addresses. The mainnet deployment info uses a consistent 4 bytes format: `0xAABB...CCDD` - i.e. 2 leading bytes and 2 ending bytes.