eip: remove "increment nonce" clause

[drortirosh]

nonce is managed by entrypoint. account doesn't have to increment it.

[yoavw]

It doesn't have to increment the nonce, but maybe "optionally enforce nonce restrictions" instead?

E.g. require(key==0) for incremental nonces, or require(seq==0) for unordered replay protection.

[drortirosh]

but maybe "optionally enforce nonce restrictions" instead?

there is a whole "Semi-abstracted Nonce Support" section. just removed obsolete mention to "increment" here.

[yoavw]

Approved, following our discussion in the previous review.