* chore: clarify newline requirement in README
Small change in newsfragments README.md, that reduces some possible room for pull-request tox workflow errors.
* style: remove double backticks for single backticks
the linter strikes again XD.
* docs: clarify trailing newline requirement in newsfragments for lint checks
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Co-authored-by: Manu Sheel Gupta <manusheel.edu@gmail.com>
