Update Mac package docs to rename nwjs binary
Update Mac package docs to rename nwjs binary

If we're going to update the Helper app binary, why not the main app binary?

This relates to https://github.com/nwjs/nw.js/issues/4293

nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js,nwjs/nw.js