[gnome-boxes] help: Update icon in the docs page

[Felipe Borges <felipeborges src gnome org>]

commit caef9adb856d93937e0c3925e627163aa6cd031f
Author: Felipe Borges <felipeborges gnome org>
Date:   Tue Mar 19 13:48:05 2019 +0100

    help: Update icon in the docs page
    
    https://help.gnome.org/users/gnome-boxes/stable/index.html.en

 help/C/figures/boxes_icon.png | Bin 3704 -> 710 bytes
 1 file changed, 0 insertions(+), 0 deletions(-)
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diff --git a/help/C/figures/boxes_icon.png b/help/C/figures/boxes_icon.png
index 0cad2a0c..36cdd09b 100644
Binary files a/help/C/figures/boxes_icon.png and b/help/C/figures/boxes_icon.png differ