Remove documented requirement in IERC1155's balanceOf

[andrew-fleming]

The zero address check was removed from ERC1155's balanceOf in #4263; however, the documentation still displays the non-zero address as a requirement. This PR proposes to fix that.

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

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Latest commit: c6eb3df

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