gobject: Document that g_object_new() zeros out private data
It’s already mentioned at
https://developer.gnome.org/gobject/stable/chapter-gobject.html#gobject-instantiation,
but is important enough that mentioning it in the documentation for
g_object_new()
seems helpful.
Signed-off-by: Philip Withnall withnall@endlessm.com
Fixes: #1022 (closed)