Markdown: fix HTML formatting broken if the beginning tag start… (#7181)
* fix markdown formatting broken if the beginning html tag starts after a list item
* add test for beginning-tag-after-a-list-item in markdown_html
* add changelog_unreleased of pr-7181
* fix test of ast breaking for beginning-tag-after-a-list-item
* update changelog_unreleased pr-7181
* fix changelog_unreleased
* fix beginning tag starts after a list item in markdown
* add test case for beginning-tag-after-a-list-item
* update changelog_unreleased