Hi. If your husband is divorced then they will probably ask to see your husbands divorce papers. They did with us. They also ask to see a photo of yourselves together (my wife showed one of us on her cell phone which kept them happy). They also ask a lot of questions about your husband but that can be done from memory e.g. husbands home address in the UK, his phone number etc etc.
Yes, you are quite right, how come they don't specify these other docs. I thought the same. In the case of my wife's friends, they didn't bring their husband's divorce papers and they had to return on another day.