The search for an 81-year-old mainland Chinese man who went missing while hiking on Hong Kong’s MacLehose Trail entered its third day on Monday, with a veteran mountaineer calling for better promotion to raise visitors’ safety awareness.A team comprising rescuers from the Fire Services Department, Government Flying Service, Civil Aid Service and police continued its search for the man, surnamed He, who went missing on Saturday while on a hike with his wife along Section 10 of the trail.According to a social media post by the Hong Kong Guardians volunteer rescue team, the couple began their hike at around 8.20am…