man: Update XIQueryVersion docs to match new version compatibility semantics

The X server now allows clients to specify any combination of versions
starting with version 2.2, document how that works.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>