Irvine, CA: Changing Shady Canyon Trail from "bicycle: mtb" back to "bicycle: yes". "mtb" is not a valid OSM value here and the path surface is already set to dirt. Changing Shady Canyon Trail paved branch back to "bicycle: designated" because there are bicycle symbols on the signs next to the trail and City of Irvine classifies it as an "Off-Street Bikeway".