Fixed header comment typos
Fixed header comment typos

YuanZhu-apple/ResearchKit,oliverschaefer/ResearchKit,YuanZhu-apple/ResearchKit,jeremiahyan/ResearchKit,boland25/ResearchKit,cornelltech/ResearchKit,md0u80c9/ResearchKit,mluedke2/ResearchKit,boland25/ResearchKit,jeremiahyan/ResearchKit,cornelltech/ResearchKit,weijentu/ResearchKit,boland25/ResearchKit,allen7wang/ResearchKit,oliverschaefer/ResearchKit,md0u80c9/ResearchKit,jeremiahyan/ResearchKit,chb/ResearchKit,md0u80c9/ResearchKit,boland25/ResearchKit,chb/ResearchKit,allen7wang/ResearchKit,YuanZhu-apple/ResearchKit,KaiCode2/ResearchKit,mluedke2/ResearchKit,oliverschaefer/ResearchKit,oliverschaefer/ResearchKit,KaiCode2/ResearchKit,md0u80c9/ResearchKit,chb/ResearchKit,weijentu/ResearchKit,cornelltech/ResearchKit,KaiCode2/ResearchKit,YuanZhu-apple/ResearchKit,allen7wang/ResearchKit,mluedke2/ResearchKit,chb/ResearchKit,weijentu/ResearchKit,weijentu/ResearchKit