If one Canadian indie band dominated the '00s — it was Tegan and Sara. But in Erin Lee Carr’s Hulu whodunnit documentary, "Fanatical: The Catfishing of Tegan and Sara," their fans' closeness began creepily bordering on something else. However, Tegan and Sara's online fandom would never be the same after a fake version of Tegan or "Fegan" began reaching out …