What is the listed surface for the Championship of Toronto that had a runner-up outcome?
CREATE TABLE "doubles_5_3_titles_2_runners_up" (
  "outcome" text,
  "year" real,
  "championship" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "surface" FROM "doubles_5_3_titles_2_runners_up" WHERE "outcome"='runner-up' AND "championship"='toronto';