docs: fix typo in configuration.html (#649)

`UserDataDictionary` -> `UseDataDictionary`

quickfixj-core/src/main/doc/usermanual/usage/configuration.html

@@ -283,7 +283,7 @@ <H3>QuickFIX Settings</H3>
     <TD> Valid XML data dictionary file, QuickFIX/J comes with the following defaults in the <code>etc</code> directory:
         FIXT11.xml, FIX50.xml, FIX44.xml, FIX43.xml, FIX42.xml, FIX41.xml, FIX40.xml.
     </TD>
-    <TD>If DataDictionary is not specified and UserDataDictionary=Y, then QuickFIX/J will look for a
+    <TD>If DataDictionary is not specified and UseDataDictionary=Y, then QuickFIX/J will look for a
         default dictionary based on the session's BeginString (e.g., FIX.4.2 = FIX42.xml). The DataDictionary
         file search strategy is to use a URL, then the file system, and then the thread context classloader (if any),
         and then the DataDictionary instance's classloader. Default data dictionary files