docs: fix grammar in tests/frontier/**/*.py

[danceratopz]

Fix grammar issues in module and function docstrings:

• test_create_deposit_oog.py: Fix module docstring grammar
• test_create_one_byte.py: Fix run-on sentence and verb forms
• test_create_suicide_store.py: Fix missing article and verb agreement
• scenarios/common.py: Fix missing periods and capitalization
• validation/test_header.py: Fix incomplete phrase
• validation/test_transaction.py: Fix awkward phrasing

🗒️ Description

🔗 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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