5 has always been sword and 6 has always been grab
If it has ever stated otherwise it was wrong. Easier way to find out what is the right button is to open your control options and the buttons are listed from top to bottom in their numerical order, starting at 0. I actually didn't know about this until someone else posted, but it has come in handy a lot for those keys that I don't use often(like Q/P and such).