Fix typo Update EthersV5Eip712Signer.md (#2466)

# Pull Request Title
**Fix typo Update EthersV5Eip712Signer.md**

## Description
This PR fixes a typo in the `EthersV5Eip712Signer.md` file. The word
"erro" has been corrected to "error."

### Changes:
- Corrected the typo: "erro" → "error" in the `EthersV5Eip712Signer.md`
file.

## Related Issues
- #3456 (replace with relevant issue number, if applicable)

## How to Test
- Review the `EthersV5Eip712Signer.md` file to ensure the typo has been
corrected.

## Checklist:
- [x] The code has been tested.
- [x] The documentation has been updated (if necessary).
- [x] I have followed the contributing guidelines.

## Notes:
- This is a minor fix and does not affect the functionality of the
project.


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## PR-Codex overview
This PR focuses on a minor code correction in the documentation for the
`EthersV5Eip712Signer`. It specifically addresses a typo in a comment
regarding the safety of the `blockHashHex` variable.

### Detailed summary
- Corrected the comment from "can't erro" to "can't error" for clarity
on the safety of `blockHashHex`.

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question}`

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