Add non-normative example section to mouse compatibility event mapping?

Hi,
Patrick Lauke (an expert in and speaker on touch behavior of browsers)
suggested on twitter (
https://twitter.com/patrick_h_lauke/status/407658393386496001) that the
MouseEvent compatibility mapping section of the PE spec would be a lot
clearer if it had an example.  Eg a simple 'for example, on tap a browser
may issue the following sequence of events when no pointer events are
cancelled..."

Thoughts?

Rick