The calipers with 2 bleeders (one top and one bottom) were done that way so they are no longer side specific and I'd imagine done this way for a reduction in manufacturing costs or inventory purposes. Bleeder at the top is then you use.
Now, that said, when you get into Wildwood/Brembo/other calipers you'll have 2 bleeders, both on top, and in this instance they are for the front 1/2 of the caliper and the rear 1/2 of the caliper and both need bled. Juts mention this so someone doesn't;t confuse having this type of caliper with 2 bleeders vs. having a "universal" caliper with 2 bleeders.
and I 2nd what Dany said, we have all kinds of fancy pressure and sucker bleeders and while they can be great for forcing fluid/air through a system, we always seem to revert back to the old pump, pump, pump, hold.... manual bleed method.