Husband-and-wife wedding photographers Mark and Jeannie Broadway shot a wedding last year that they’ll never forget: it was one in which the flower girl was a 3-year-old cancer survivor who had been saved by bone marrow donated by the bride. Hayden Ryals had been walking through campus at Auburn University as a student in 2015 when she came across a Be The Match table. She decided to put her name into the national registry of volunteer bone marrow donors. About…