I searched for "wrap" in keyboard mappings without success. I don't see this option in menu neither.
EDIT: I was thinking about result the you get let's say in Notepad2 by pressing Ctrl+W (or selecting View -> Word Wrap). So I'am asking about toggling such Word Wrap
In Tools->Options there is a whole section on line wrapping. The options you choose here will depend on how you need to do the wrapping - it is quite configurable.
Hope this helps...