Update the Markdown third-level heading style
Update the Markdown third-level heading style

splicers/orientation,codeschool/orientation,codio/orientation,orientation/orientation,cmckni3/orientation,LogicalBricks/orientation,hashrocket/orientation,LogicalBricks/orientation,jefmathiot/orientation,robomc/orientation,friism/orientation,Scripted/orientation,Scripted/orientation,codeschool/orientation,ferdinandrosario/orientation,liufffan/orientation,codeschool/orientation,Scripted/orientation,friism/orientation,orientation/orientation,smashingboxes/orientation,smashingboxes/orientation,IZEA/orientation,codio/orientation,hashrocket/orientation,orientation/orientation,twinn/orientation,splicers/orientation,ferdinandrosario/orientation,orientation/orientation,cmckni3/orientation,twinn/orientation,IZEA/orientation,cmckni3/orientation,splicers/orientation,liufffan/orientation,robomc/orientation,jefmathiot/orientation