docs: fix grammar in src/ethereum/forks/*/vm/instructions (keccak, log, memory, stack)

[danceratopz]

Fix verb tense consistency and article agreement in docstrings:

• memory.py: "Load word" -> "Loads a word", "Push the size" -> "Pushes the size", "Copy the bytes" -> "Copies the bytes"
• stack.py: "Remove item" -> "Removes an item", "Pushes a N-byte" -> "Pushes an N-byte", "Duplicate the Nth" -> "Duplicates the Nth", "Swap the top" -> "Swaps the top"

🗒️ 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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