Remove reference to ...Iface data structures; which eliminates

Remove reference to ...Iface data structures; which eliminates

* docs/atk-sections.txt docs/tmpl/atkaction.sgml
docs/tmpl/atkcomponent.sgml docs/tmpl/atkdocument.sgml
docs/tmpl/atkeditabletext.sgml docs/tmpl/atkhypertext.sgml
docs/tmpl/atkimage.sgml docs/tmpl/atkobject.sgml
docs/tmpl/atkselection.sgml docs/tmpl/atkstreamablecontent.sgml
docs/tmpl/atktable.sgml docs/tmpl/atktext.sgml
docs/tmpl/atkvalue.sgml:
Remove reference to ...Iface data structures; which eliminates
undocumented symbols.