Update ERC-4626: Update erc-4626.md to fix the broken link.

[achiko]

a minimal implementation broken link fixed: https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC4626.sol

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[eip-review-bot]

File ERCS/erc-4626.md

Requires 3 more reviewers from @axic, @g11tech, @gcolvin, @lightclient, @samwilsn, @xinbenlv

[github-actions[bot]]

The commit aaf696e7fe9d87bb14b4f78b2573b5a1d3eab8b1 (as a parent of 2ded9ea578eafb5e00e8f2f6fc470eb98c7140fe) contains errors. Please inspect the Run Summary for details.