Update EIP-2935: note possible ADD overflow

[chfast]

[eth-bot]

File EIPS/eip-2935.md

Requires 1 more reviewers from @g11tech, @gballet, @jochem-brouwer, @jsign, @tanishqjasoria, @tkstanczak, @vbuterin

[g11tech]

ahh thank you for reviewing: have addressed it like this: ~~- https://github.com/ethereum/EIPs/pull/8514~~

• https://github.com/ethereum/EIPs/pull/8515

since subtraction will also involve underflow check etc, and input is not going to go beyond 8 bytes which is the type size assumed in various specs including the CL spec types

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