fix(docs): correct s component range in eth_signature documentation

[strmfos]

Summary

Fix incorrect documentation for s component range validation in verify_eth_signature and is_eth_signature_valid functions.

Type of change

• Documentation change with concrete technical impact

Why is this change needed?

The documentation stated that both r and s components are validated in range [1, N), but the actual code validates s in the stricter range [1, N/2] (via is_signature_s_valid). This is an important distinction for signature malleability protection (EIP-2).

What was the behavior or documentation before?

Documentation incorrectly stated:

"Also verifies that the r and s components of the signature are in the range [1, N)"

What is the behavior or documentation after?

Documentation now correctly states:

"Also verifies that the r component of the signature is in the range [1, N), and the s component is in the range [1, N/2]"

[reviewable-StarkWare]

This change is 

[orizi]

@orizi reviewed 1 file and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @strmfos).