White House Press Secretary Karine Jean-Pierre seized an opportunity to make a quick joke Thursday at the expense of Fox News reporter Peter Doocy, who a day earlier had questioned how Vice President Kamala Harris speaks at a news briefing. Doocy, whose questioning has often resulted in drama during press briefings, had questioned on Tuesday why Harris’ accent sometimes sounds slightly different from one event to another, including while addressing two different events in Detroit and Pittsburgh — a phenomenon known as “code-switching” that’s a common part of communication between people who mo…