[gimp-help-2] Description what the information window represents. Fixes #640928

[Roman Joost <romanofski src gnome org>]

commit c33600a698884b9f186fb6dbaeae01e4e978877c
Author: Roman Joost <roman bromeco de>
Date:   Mon Sep 10 09:30:55 2012 +1000

    Description what the information window represents. Fixes #640928

 src/toolbox/transform/perspective.xml |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/src/toolbox/transform/perspective.xml b/src/toolbox/transform/perspective.xml
index 927f803..510a3b0 100644
--- a/src/toolbox/transform/perspective.xml
+++ b/src/toolbox/transform/perspective.xml
@@ -129,8 +129,11 @@
         <term>Matrix</term>
         <listitem>
           <para>
-            You can get a small knowledge about matrices in the
-            <xref linkend="plug-in-convmatrix"/>.
+            The information window shows a mathematical representation
+            of the perspective transformation. You can find more
+            information about transformation matrices on
+            <ulink
+              url="http://en.wikipedia.org/wiki/Transformation_Matrices";>Wikipedia</ulink>.
           </para>
         </listitem>
       </varlistentry>