update OPACDisplay856uAsImage to be clearer

diff --git a/en/manual.xml b/en/manual.xml
index b60bd3c..06fa328 100644 (file)
--- a/en/manual.xml
+++ b/en/manual.xml
@@ -7696,7 +7696,7 @@
                   <listitem>
                     <important>
                       <para><link linkend="OPACXSLTDetailsDisplay">OPACXSLTDetailsDisplay</link>
-                      needs to be on for this preference to work.</para>
+                        needs to have a value in it for this preference to work.</para>
                     </important>
                   </listitem>
                 </itemizedlist>