This makes it easier to read and copy/paste the contents when preparing
a Lix release blog post.
The output can be read in
`build/doc/manual/src/release-notes/rl-next-generated.md`.
Before:
## Breaking changes
- Release note 1
Many thanks to ...
- Release note 2
Many thanks to ...
## Fixes
- Release note 3
Many thanks to ...
After:
## Breaking changes
- Release note 1
Many thanks to ...
- Release note 2
Many thanks to ...
## Fixes
- Release note 3
Many thanks to ...
Change-Id: Ifea5af1bdce7b2315f3b46c17ebb945e99cfb36f