[gimp-help] Fix the wrong image reference spotted by Tim Sabsch in #109

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit e09145b7d4e8eb32586ad0cd7b191e6b23d7948f
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Sat Sep 29 18:46:41 2018 +0300

    Fix the wrong image reference spotted by Tim Sabsch in #109

 src/toolbox/transform/align.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/toolbox/transform/align.xml b/src/toolbox/transform/align.xml
index 110ac31d5..a21d49d51 100644
--- a/src/toolbox/transform/align.xml
+++ b/src/toolbox/transform/align.xml
@@ -332,7 +332,7 @@ fileref="images/toolbox/align-ex-ref-path.png"     format="PNG"/>
                     </listitem>
                     <listitem>
                       <para>
-<inlinegraphic fileref="images/tool-options/align-vfill.png"/>: to 
+<inlinegraphic fileref="images/tool-options/stock-gravity-vcenter-24.png"/>: to 
                         distribute centers of targets with center of 
                         reference vertically.
                       </para>