Move GtkIMContext to "Abstract Base Classes", since its abstract.

Move GtkIMContext to "Abstract Base Classes", since its abstract.

2003-06-24  Matthias Clasen  <maclas@gmx.de>

	* gtk/gtk-docs.sgml: Move GtkIMContext to "Abstract Base Classes", since its abstract.

	* gtk/tmpl/gtkaccessible.sgml:
	* gtk/tmpl/gtkimmulticontext.sgml:
	* gtk/tmpl/gtkimcontextsimple.sgml:
	* gtk/tmpl/gtkimcontext.sgml:
	* gtk/tmpl/gtkviewport.sgml:
	* gtk/tmpl/gtkcellrenderertext.sgml:
	* gtk/tmpl/gtkcellrendererpixbuf.sgml:
	* gtk/tmpl/gtkcelleditable.sgml:
	* gtk/tmpl/gtktreemodelsort.sgml:
	* gtk/tmpl/gtktreednd.sgml:
	* gtk/tmpl/gtktreesortable.sgml: Add short descriptions.