version checking pod RFC

["Ross McFarland" <rwmcfa1 neces com>]

following up last night's commit here's some potential pod doc about how to
check versions. this would go in Glib.pm, something similar or a pointer to
this should go in Gtk2.

http://www.neces.com/gtk2-perl/version_pod.patch

unless there are major problems i'll commit it tomorrow sometime. i don't know
no english so i'm sure it sucks as far as grammer and spelling go.

-rm