To be able to distinguish changelog entries from each other, we should
write a specific project name, e.g. scripts, instead of `PR`.
Changelog entries with a simple `PR` usually cause so much additional
rework when doing actual releases.
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.
The changelog entries should be directly used for the release notes,
thus they need to be short and hold only information relevant to the
end user, and should be in the markdown bullet point format.
If we use date format of DD-MM-YYYY in changelog file names, the files
will not sorted by date. e.g. 01-12-2021 will come before 25-11-2021.
Use date format of YYYY-MM-DD to make the files sorted by date.
