Fix javadoc for module "html"

See #396.

Author: dr0i

metafacture-html/src/main/java/org/metafacture/html/HtmlDecoder.java

@@ -123,6 +123,12 @@ private boolean handleAttributeValuesAsSubfields(final StreamReceiver receiver,
         return false;
     }
 
+    /**
+     * Sets attribute values as subfields. If the value(s) start with an `&` they
+     * are appended to {@link #DEFAULT_ATTR_VALS_AS_SUBFIELDS}.
+     *
+     * @param mapString the attributes to be added as subfields
+     */
     public void setAttrValsAsSubfields(final String mapString) {
         this.attrValsAsSubfields = new HashMap<String, String>();
         final String input = mapString.startsWith("&") ? DEFAULT_ATTR_VALS_AS_SUBFIELDS + mapString : mapString;