Actually, it’s like the two-space after periods, replacing a longer space: it's a workaround when typesetting does not collapse punctuations. The dot should be

Actually, it’s like the two-space after periods, replacing a longer space: it's a workaround when typesetting does not collapse punctuations. The dot should be below the outer edge of the quotes, otherwise you have too much diagonal white space — not unlike upper-case A and V should be set closer.