chore: add "seconds" to scan interval display for clarity

[jochman]

Proposed change

The scan interval option has no tooltip for what the number means. By adding "(seconds)" it's much clearer to the user that the interval is mentioned in seconds and not minutes.

Type of change

• [ ] Bugfix
• [ ] New feature
• [ ] Code quality improvements to existing code or addition of tests
• [x] Documentation

Additional information

Checklist

• [x] The code change is tested and works locally.
• [x] The code has been formatted using Black.
• [] Tests have been added to verify that the new code works.
• [x] Documentation added/updated if required.

[github-actions[bot]]

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