UPDATE 1 — Bolsonaro's lead over Lula narrows ahead of Brazil runoff, Datafolha poll shows
(Updates with details, context in bullets 3-7) SAO PAULO, Oct 15 (Reuters) — Brazilian Senator Flavio Bolsonaro continues to slightly lead President Luiz Inacio Lula da Silva heading to the October 25 election runoff, but the gap has narrowed, a Datafolha poll showed on Thursday. The senator, the eldest son of former P