added feature code usage documention to builder docs
added feature code usage documention to builder docs

siplabs/kazoo-php-sdk,2600hz/kazoo-php-sdk,dhdanno/kazoo-php-sdk,voxter/kazoo-php-sdk,2600hz/kazoo-php-sdk,dhdanno/kazoo-php-sdk,siplabs/kazoo-php-sdk,2600hz/kazoo-php-sdk,voxter/kazoo-php-sdk