man: add a warning that wheel emu inertia must be set and it isn't inertia

First, it's not actually inertia, it's simply the scroll distance, yay for the
misnomer.

And it needs to be set for any device that is more fine-grained than a
mouse, especially absolute devices. For example the VirtualBox device has an
abs max of 32767, so a simple motion may have a delta of to 2000 units and
that results in 200 scroll events. That's a bit excessive.

Related to: https://bugs.freedesktop.org/show_bug.cgi?id=93617

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

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