Four educators who work in Dorchester or Mattapan schools were cited for their service at an awards program held in the Seaport district last week. The honorees included Tanisha Milton, Grade 8 History at TechBoston Academy in Dorchester; Donald Neville, Grade 7 Math at Mildred Avenue K-8 in Mattapan; Deborah Doherty, school nurse, Jeremiah Burke High School in Dorchester; and