Tearoffs in GtkItemFactory - their existence is omitted in thereference documentation

[Matthew Hiller <matthew hiller yale edu>]

Hello,

	Someone may want to fix this - the reference documentation on
GtkItemFactory doesn't mention "<Tearoff>" as a valid GtkItemFactoryEntry
item_type (I had to look at the gtk+ source to learn that it was.)

Thanks much,
Matt Hiller