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Fix some changelog markdown formatting #1328

Job	Run time
Run 'mypy' on python 3.x	28s
Self-Check	11s
ensure-catalog-matches-hook-config	21s
Run 'twine-check' on python 3.x	26s
Run tests on ubuntu-latest, py3.8	1m 11s
Run 'py-mindeps' on python 3.8	24s
Run tests on ubuntu-latest, py3.9	57s
test-sdist	1m 36s
Run tests on ubuntu-latest, py3.10	1m 16s
Run tests on ubuntu-latest, py3.11	1m 0s
Run tests on ubuntu-latest, py3.12	1m 10s
Run tests on windows-latest, py3.8	1m 40s
Run tests on windows-latest, py3.9	2m 17s
Run tests on windows-latest, py3.10	1m 36s
Run tests on windows-latest, py3.11	2m 0s
Run tests on windows-latest, py3.12	1m 49s
Run tests on macos-latest, py3.8	1m 10s
Run tests on macos-latest, py3.9	43s
Run tests on macos-latest, py3.10	57s
Run tests on macos-latest, py3.11	56s
Run tests on macos-latest, py3.12	50s
Collate results to check for skipped tests	6s
	23m 4s

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