docs(base-contracts): OptimismMintableERC20Factory mainnet address inconsistency and incorrect footnote

[maho0638]

Problem

File: docs/base-chain/network-information/base-contracts.mdx

The L2 contract address table lists different addresses for OptimismMintableERC20Factory on mainnet vs testnet:

• Mainnet: 0xF10122D428B4bc8A9d050D06a2037259b4c4B83B
• Testnet: 0x4200000000000000000000000000000000000012

According to the OP Stack specification, the canonical predeploy address for OptimismMintableERC20Factory is 0x4200000000000000000000000000000000000012 on all OP Stack chains (both mainnet and testnet).

Additional issue

The footnote at the bottom of the L2 table states:

L2 contract addresses are the same on both mainnet and testnet.

This is contradicted by the table itself, since the two OptimismMintableERC20Factory addresses differ.

Expected behavior

Either:

1. Update the mainnet OptimismMintableERC20Factory address to 0x4200000000000000000000000000000000000012 if the current entry is outdated, OR
2. Add a clarifying note explaining that the mainnet entry is a legacy/wrapper contract, and update the footnote to reflect the exception.

References

• OP Stack predeploys: https://specs.optimism.io/protocol/predeploys.html