Remove a note from the docs that is now obsolete
Remove a note from the docs that is now obsolete

Chaining up in signal handlers now correctly handles boxed objects, so this
note about chaining up in a size-request signal handler can go.

potyl/perl-Gtk2,cpanxaoc/perl-Gtk2,potyl/perl-Gtk2,potyl/perl-Gtk2,cpanxaoc/perl-Gtk2,cpanxaoc/perl-Gtk2