Improve the wording around error return values
Improve the wording around error return values

For rsvg_handle_write(), this wording indicates the possibility of
that function being able to return FALSE again in the future (maybe if
the accumulation buffer can't grow due to out-of-memory).

GNOME/librsvg,GNOME/librsvg,GNOME/librsvg,GNOME/librsvg