docs only return "list" in two spots

[Kevin Ryde <user42 zip com au>]

I noticed get_size_request shows "list" as its return in the docs, it'd
be nice it was "width,height", perhaps per below.  I did a bit of a grep
and pixbuf->get_file_info may be the only other one not already ok,
among what's under the Gtk2 dir at least.

Attachment: GtkWidget.xs.get_size_request.diff
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Attachment: GdkPixbuf.xs.get_file_info.diff
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