BHV-2146: Fix documentation for useSubCaption property.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #81 from enyojs/BHV-2146-aarontam

BHV-2146: Fix documentation for useSubCaption property.

Reviewed-By: Ben Combee (ben.combee@lge.com)