Typo fixes. (#65607)

Typo fixes. (#65607)

        * gtk/gtkaccelmap.c: Typo fixes. (#65607)

        * gtk/gtkfixed.c (gtk_fixed_set_has_window, gtk_fixed_get_has_window):
        Fix docs. (#65505)

        * gtk/gtkwindow.c (gtk_window_set_mnemnonic_modifier): Document.

        * gtk/tmpl/gtkwindow.sgml: Document gtk_window_position.

        * gdk/tmpl/dnd.sgml: Document GdkDragProtocol and GdkDragContext.

        * gdk/tmpl/events.sgml: Document gdk_setting_get.

        * gdk/tmpl/fonts.sgml: Document gdk_font_full_name_get and
        gdk_font_full_name_free.

        * gdk/tmpl/windows.sgml: Document gdk_window_register_dnd.