Yankees scramble as Gregorius begins ‘hopefully short’ DL stint

MIAMI — Didi Gregorius’ bruised left heel is improving, according to Yankees manager Aaron Boone, but not quickly enough for the shortstop to avoid being placed on the disabled list. “Hopefully [his stay] is short — the next couple of days will really tell us the picture. He is better [Tuesday] than [Monday],’’ Boone said…