@dmethvin asked here: https://github.com/jquery/jquery/pull/1542#issuecomment-38098198

I don't know off hand if any other projects mention doing this but installing an arbitrary file instead of an actual package is described here: http://bower.io/#installing-packages-and-dependencies, in the last bullet point under "Where `<package>` can be any one of the following"

This obviously isn't the best way to install jQuery but according to what @dmethvin has said, there seems to be a number of people who for one reason or another have a problem with getting more than just `jquery.js` from the Bower package. This update the documentation is attempting to highlight an alternative in case they didn't think of it on their own.