With the FIFA World Cup literally kicking off next week in the U.S., Canada and Mexico — an unprecedented triple-nation collaboration that makes the last of those countries the first in history to host the soccer tournament a third time — Netflix ‘s release of “ Mexico 86 ” is opportunistically timed. Unfolding largely off the pitch, Gabriel Ripstein ‘s loosely fact-based comedy (“Some of these things did happen,” an opening title card assures us) delves irreverently into the allegedly iffy