Javadoc for selector parse exceptions

Fixes jhy#507

Author: jhy

src/main/java/org/jsoup/nodes/Element.java

@@ -252,6 +252,7 @@ public List<DataNode> dataNodes() {
      * @param cssQuery a {@link Selector} CSS-like query
      * @return elements that match the query (empty if none match)
      * @see org.jsoup.select.Selector
+     * @throws Selector.SelectorParseException (unchecked) on an invalid CSS query.
      */
     public Elements select(String cssQuery) {
         return Selector.select(cssQuery, this);

src/main/java/org/jsoup/select/Selector.java

@@ -99,6 +99,7 @@ private Selector(Evaluator evaluator, Element root) {
      * @param query CSS selector
      * @param root  root element to descend into
      * @return matching elements, empty if none
+     * @throws Selector.SelectorParseException (unchecked) on an invalid CSS query.
      */
     public static Elements select(String query, Element root) {
         return new Selector(query, root).select();