Fill in since annotations (#10352)

Author: krisstern

core/src/main/java/hudson/model/UpdateSite.java

@@ -208,7 +208,7 @@ public long getDataTimestamp() {
      * Opens a connection to the given URL
      * @param src the url to connect to
      * @return A {@code URLConnection} for the given src URL
-     * @since TODO
+     * @since 2.499
      */
     public URLConnection connect(URL src) throws IOException {
         return ProxyConfiguration.open(src);
@@ -219,7 +219,7 @@ public URLConnection connect(URL src) throws IOException {
      *
      * @param src The location of the resource on the network
      * @throws IOException if the validation fails
-     * @since TODO
+     * @since 2.499
      */
     public void preValidate(URL src) throws IOException {
         // no validation needed in the default setup