[gnomemm-website] Documentaton: Remove link to (removed) Amazon Kindle book.

[Murray Cumming <murrayc src gnome org>]

commit 7f381e919bd456d7fdfa54498644e1eeea091e12
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Jan 30 11:23:22 2014 +0100

    Documentaton: Remove link to (removed) Amazon Kindle book.
    
    Amazon removed it a while ago because they do not allow Kindle books
    to be under open source licenses (because they don't like content
    to be available gratis online elsewhere).

 docs/C/documentation.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/C/documentation.xml b/docs/C/documentation.xml
index 1d804a7..4079647 100644
--- a/docs/C/documentation.xml
+++ b/docs/C/documentation.xml
@@ -20,7 +20,7 @@
 
       <sect2>
         <title>Getting Started with gtkmm</title>
-        <para>You might start by reading the <emphasis role="bold">Programming with gtkmm</emphasis> online 
book. This book is also <ulink 
url="http://www.amazon.com/gp/product/B0050I6FR4/ref=as_li_ss_tl?ie=UTF8&amp;tag=murrayswebpages&amp;linkCode=as2&amp;camp=217153&amp;creative=399701&amp;creativeASIN=B0050I6FR4";>available
 on the Amazon Kindle</ulink>. Versions for the older gtkmm 2 API are also available.</para>
+        <para>You might start by reading the <emphasis role="bold">Programming with gtkmm</emphasis> online 
book.</para>
         <para><ulink url="&url_refdocs_base_book_html;index.html">Contents</ulink> of the whole online 
book.</para>
         <para>Selected chapters:<itemizedlist>
             <listitem>