ENYO-3600: Update documentation to not reference deprecated method.

This commit removed the deprecated method in question: https://github.com/enyojs/moonstone/commit/f8b87346e0b1e9bb1fcf39b36d27e511c7ea8719

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>