I cannot figure out what Step 8 in 'Assemble the Yoke' is asking me to do, in particular the bit about 'fold the seam allowance at the armhole seams...' Uh? Do I then sew my seam over this folded part? I have searched high and low on this forum and the net for some guidance. If someone could help me out, I would really appreciate it. (I am confused and wondering am I the only person out there who doesn't understand this step? I am a beginner who I thought was starting to improve, but maybe not!)