By Alan Charlish MEDYKA, Poland (Reuters) -Record numbers of refugees headed into Poland from Ukraine with the total number expected to surpass 1 million later on Sunday, as Russian forces continued shelling Ukraine’s cities. Polish border guards cleared as many as 129,000 people at border crossings on Saturday, the latest data showed, the most in a single day since the war started on February 24, bringing the total to 922,400. “Check-in is as simplified as possible,” Polish Border Guard spokeswoman Anna Michalska said. “The point is to confirm the identity of persons, verify documents, check …