Kai Lueke 27541f3a92 changelog/README.md: specify current security fix section format
The entries added in changelog/security/ do not follow our existing
security section in the release notes:
  https://www.flatcar.org/releases/#release-3033.2.0

Document the structure and an example to use the right format that we
need for release note generation.
2022-01-12 17:30:38 +01:00
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