I'm not from StackOverflow's team (Obviously!).
But I put forward my views.
Any text wrapped inside double asterisks (**) but outside of markdown context is meant to be emphasized.
And I believe the page is out of mark down context.
I think the page is just html, otherwise ** should have been rendered as well.
So here double asterisks mean emphasization of the word. If they wanted to make it bold, they could have done it easily. It was not meant to be either italicized or bolded. I think, they wanted it to stand out from the rest.