Hints for polycule in testing

Hints

• asv-cid-maybe-not-rdns
  :3 - business.braid.polycule
  The component ID might not follow the reverse domain-name schema (the TLD used by it is not known to the validator).
• asv-unknown-tag
  :73 - developer
  Found invalid tag. Non-standard tags should be prefixed with `x-`. AppStream also provides the <custom/> tag to add arbitrary custom data to metainfo files. This tag is read by AppStream libraries and may be useful instead of defining new custom toplevel or `x-`-prefixed tags if you just want to add custom data to a metainfo file.