s/columns/rows/ in docs. (#70199)

s/columns/rows/ in docs. (#70199)

	* gtk/gtktreeview.c (gtk_tree_view_set_reorderable):
	s/columns/rows/ in docs.  (#70199)

	* gtk/gtktreestore.c (gtk_tree_store_insert): s/before/after/ in
	docs. (#71852, #68405)

	* gtk/gtkcalendar.c (gtk_calendar_select_day): Correct a comment.

	* gtk/tmpl/gtksignal.sgml, gtk/tmpl/gtkimage.sgml: s/%d/%%d/ in
	examples.  (#71479)

	* gtk/tmpl/gtkmenu.sgml: Document gtk_menu_set_active as
	quasi-private.  (#69788)

	* gtk/tmpl/gtkcalendar.sgml: Document month as zero-based and
	selected_day as one-based.  (#57169)