How many notes are there for the Devon Alexander vs. Shawn Porter fight?
CREATE TABLE "2013" (
  "date" text,
  "location" text,
  "fight" text,
  "division" text,
  "titles" text,
  "rematch" text,
  "tv" text,
  "promoter" text,
  "notes" text
);
SELECT COUNT("notes") FROM "2013" WHERE "fight"='Devon Alexander vs. Shawn Porter';