"You can also use Numbered headings when exporting to PDF..."
"Numbered Headings examples will be posted here soon!"
I´ve been referred here by Atlassian support, because their PDF numbered headings rather is an annoyance than a solution. It numbers the headings in the PDF TOC, but not in the body / content which is worse than not numbering at all, because customers report this as a bug.
I can find nothing but the claim here too. Don´t ask me how I feel!