Update to r51567:

handbook] remove two links from the zfs links page

These two links just go to ads pages. For the "evil tuning guide" I was
able to find find some pages with a similar title but they are
years old and don't give current advice. For "ZFS Best Practices Guide"
there are many variants and none seemed particularly worthwhile to link.

de_DE.ISO8859-1/books/handbook/zfs/chapter.xml

@@ -4,7 +4,7 @@
      The FreeBSD German Documentation Project
 
      $FreeBSD$
-     basiert auf: r51460
+     basiert auf: r51567
 -->
 
 <chapter xmlns="http://docbook.org/ns/docbook"
@@ -3784,18 +3784,6 @@ vfs.zfs.vdev.cache.size="5M"</programlisting>
 	    Guide</link></para>
       </listitem>
 
-      <listitem>
-	<para><link
-	    xlink:href="http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide"><acronym>ZFS</acronym>
-	    Evil Tuning Guide</link></para>
-      </listitem>
-
-      <listitem>
-	<para><link
-	    xlink:href="http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide"><acronym>ZFS</acronym>
-	    Best Practices Guide</link></para>
-      </listitem>
-
       <listitem>
 	<para><link
 	    xlink:href="https://calomel.org/zfs_raid_speed_capacity.html">Calomel