Update EIP-3026: remove repetitive word

[InventiveCoder]

ATTENTION: ERC-RELATED PULL REQUESTS NOW OCCUR IN ETHEREUM/ERCS

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[eth-bot]

File EIPS/eip-3026.md

Requires 1 more reviewers from @hujw77, @iammichaelconnor, @yelhousni

[lightclient]

fixed in #8373