Hints for ethtool in main

Hints

• asv-summary-first-word-not-capitalized
  :6 -
  The summary text does not start with a capitalized word, project name or number.
• asv-content-rating-missing
  -
  This component has no `content_rating` tag to provide age rating information. You can generate the tag data online by answering a few questions at https://hughsie.github.io/oars/