[simple-scan] help: Fix incorrect statement about PNG files

[Andre Klapper <aklapper src gnome org>]

commit 8f5a29d2fcddfdcad5cdaae73ced0a28d0334109
Author: Andre Klapper <a9016009 gmx de>
Date:   Tue Feb 4 14:28:16 2020 +0100

    help: Fix incorrect statement about PNG files
    
    Fixes #145

 help/C/save.page | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/help/C/save.page b/help/C/save.page
index bc742d7..5ebf182 100644
--- a/help/C/save.page
+++ b/help/C/save.page
@@ -60,7 +60,7 @@
        </tr>
        <tr>
                <td><p>PNG</p></td>
-               <td><p>PNG files contain the raw data from the scanner. This makes them very large and not 
suitable
+               <td><p>PNG files support lossless data compression. This can make files very large and not 
suitable
                for distributing. If you have scanned multiple pages, a PNG file will be created for each 
page.
                See the <link href="http://en.wikipedia.org/wiki/Portable_Network_Graphics";>PNG Wikipedia 
page</link>
                for more information.