JSON fix: added comment in cool_min_layer_time description about Minimum Speed (CURA-2720)
JSON fix: added comment in cool_min_layer_time description about Minimum Speed (CURA-2720)

hmflash/Cura,fieldOfView/Cura,Curahelper/Cura,Curahelper/Cura,hmflash/Cura,ynotstartups/Wanhao,fieldOfView/Cura,ynotstartups/Wanhao