Søren Bredlund Caspersen authored Jan 08, 2021 and freetrader committed Jan 08, 2021

Get rid of markdown warnings regarding lists (except some MD004) in `doc/release-notes/*.md` and `doc/gitian-building/*.md`.

Test plan:
- Run `markdownlint --version` to check that you are on version 0.25.0 or later. If not, install using NPM.
- From base folder, run `markdownlint -c .markdownlint.json -o /tmp/mdl.out doc/release-notes/*.md doc/gitian-building/*.md`
- Run `grep -i list /tmp/mdl.out | sed 's/^.* MD0/MD0/g' | sort -u` and check that only one line is output and it contains the MD004 description