some doc


git-svn-id: svn://oss.beweb.dbc.dk/sync_php/php/OpenLibrary/OpenOrder/trunk@76086 30e9dc4a-7611-4fbc-83ba-eecf79b76bd0
xsd: placeOrderErrorType added invalid_needBeforeDate
replaced 'needBeforeDate must be tomorrow or later' with 'invalid_needBeforeDate'


git-svn-id: svn://oss.beweb.dbc.dk/sync_php/php/OpenLibrary/OpenOrder/trunk@76087 30e9dc4a-7611-4fbc-83ba-eecf79b76bd0