Hints for firmware-linux-free in main

Hints

• asv-driver-firmware-description-missing
  firmware-linux-free.metainfo.xml -
  It is recommended to add a long description to this component to present it better to users.
• asv-summary-has-dot-suffix
  firmware-linux-free.metainfo.xml:5 - Binary firmware for This package contains firmware which was previously included in the Linux kernel and which is compliant with the Debian Free Software Guidelines. . Most firmware previously included in the Linux kernel is non-free and has been moved to the firmware-linux-nonfree package..
  The component summary should not end with a dot (`.`).