With the final three episodes of Prince Harry and Meghan Markle’s Netflix docuseries, the couple doesn’t ruminate about distancing themselves from the royal family so much as explain — in further depth than has already been reported — what they were thinking and feeling at the time. After the table setting of the first half, “Harry & Meghan” from director Liz Garbus becomes more of an extended sit-down interview in the second half. The couple describes the growing hostility to their presence in the U.K., so they proposed stepping back from full-time royal duties. Key members of Harry’s family …