Fix Model.NoRowsUpdatedError documentation
Fix Model.NoRowsUpdatedError documentation

Fixes #966/#967

Update the documentation to reflect that `Model.save` makes use of this
error, and update error name so it corresponds with the rest of the
documentation.

cspotcode/bookshelf,seegno-forks/bookshelf,tgriesser/bookshelf,chrisbroome/bookshelf,cspotcode/bookshelf,jadengore/bookshelf,apla/bookshelf,tgriesser/bookshelf,rbong/bookshelf,bookshelf/bookshelf,bookshelf/bookshelf,TinOo512/bookshelf,chrisbroome/bookshelf,rbong/bookshelf,jordansexton/bookshelf,apla/bookshelf,jadengore/bookshelf,jadengore/bookshelf,seegno-forks/bookshelf,TinOo512/bookshelf,jordansexton/bookshelf