add missing line break

Doc/lib/xmlsaxhandler.tex

@@ -65,7 +65,7 @@ symbolic constants for the feature and property names.
 \end{datadesc}
 
 \begin{datadesc}{feature_string_interning}
-  Value: \code{"http://xml.org/sax/features/string-interning"}
+  Value: \code{"http://xml.org/sax/features/string-interning"}\\
   true: All element names, prefixes, attribute names, Namespace URIs, and
         local names are interned using the built-in intern function.\\
   false: Names are not necessarily interned, although they may be (default).\\