docs intro.rst: invalid FILESAVING notification vs valid FILEBEFORESAVE #148
Description
The Handling Notifications section of the intro.rst goes back and forth from calling the notification FILESAVING (wrong) and FILEBEFORESAVE (correct). Most of the instances of FILESAVING are in the text, rather than in the example code, so that's less problematic, but in the Cancelling Callbacks subsection, it's in the example code, too. But to avoid confusion, they should all be FILEBEFORESAVE.