Don't mention the SLE Storage guide in the openSUSE docs (BSC#1170927)

Author: cwickert

xml/deployment_expert_partitioner_overview.xml

@@ -463,7 +463,7 @@
          deletes all data from the partition.
         </para>
        </warning>
-       <para>
+       <para os="sles;sled">
         For details on the various file systems, refer to &storage_guide;.
        </para>
       </listitem>