Fix broken link due to Middleman link_to pickiness.
Fix broken link due to Middleman link_to pickiness.

NREL/api-umbrella,apinf/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,apinf/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,apinf/api-umbrella,NREL/api-umbrella