Reshelving is not a word in common use. You may understand it, but others might guess at its meaning. This is the first time I've come across the word, and I understood what you mean by it; but to be sure, I would probably go ask you if it means what I think it means by saying something stupid like, "when I looked up a book it said reshelving, what does that mean?"
Edit: In fact, the word is not even found on Dictionary.com and is probably just nomenclature specific to librarians, although the meaning of it, in context, is somewhat self-explanatory.