Even if King Arthur didn't return to the aid of Great Britain during World War II, other heroes like Wonder Woman, Captain America, Sherlock Holmes and The Scarlet Pimpernel aided the Allies.  Now they are joined by Megan Monaghan Rivas's Three Musketeers: 1941 at the Jeffrey and Paula Gural Theatre at A.R.T./New York Theatres.  June  27-30 are Rivas's likable re-imagination's final performances.  Hopefully her smart update will find audiences beyond NYC. Commissioned for the Women in Theatre (WIT) Festival, the four loyal guards are now dedicated female Resistance fighters.  The time transition is so smooth that there's no need to be familiar with the 1844