Minor javadoc fixup: add closing double quote

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1716768 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/fo/properties/BackgroundPositionShorthand.java

@@ -29,7 +29,7 @@ import org.apache.fop.fo.PropertyList;
 import org.apache.fop.fo.expr.PropertyException;
 
 /**
- * Class encapsulating functionality for the <a href="http://www.w3.org/TR/xsl/#background-position>
+ * Class encapsulating functionality for the <a href="http://www.w3.org/TR/xsl/#background-position">
  * <code>background-position</code></a> shorthand.
  */