docs: fix grammar in point_evaluation.py and p256verify.py

[danceratopz]

🗒️ Description

Summary

• Fixed module docstring formatting in all 7 p256verify.py files:
  • Removed errant period after "Introduction" heading
  • Added missing blank line between heading underline and content
  • Added backticks around P256VERIFY precompile name for consistency with other precompiles
• Added backticks around POINT EVALUATION in all 9 point_evaluation.py files
• Reviewed 17 blake2f.py files - no issues found

Test plan

• Verified changes pass ruff format and ruff check

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx tox -e static

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered adding an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.
• Tests: For PRs implementing a missed test case, update the post-mortem document to add an entry the list.
• Ported Tests: All converted JSON/YML tests from ethereum/tests or tests/static have been assigned @ported_from marker.

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