[db2omf] Fixed error message about OMF date: refer to pubdate
[db2omf] Fixed error message about OMF date: refer to pubdate

jnavila/gnome-doc-utils,Distrotech/gnome-doc-utils,jnavila/gnome-doc-utils,Distrotech/yelp-xsl,Distrotech/gnome-doc-utils,Distrotech/yelp-xsl