JDK 10 RFR of JDK-8189952: New methods on String: chars() and codePoints() should be marked since 9

[joe darcy]

Hello,

The initial changeset which introduced these the methods String.chars() 
and String.codePoints(), JDK-8071477 , had the expected @since tags for 
the time (@since 1.9), but subsequent changes to String seem to have 
removed them.

Please review the patch below to add them back.

Thanks,

-Joe

--- a/src/java.base/share/classes/java/lang/String.java    Thu Oct 26 
17:06:52 2017 -0700
+++ b/src/java.base/share/classes/java/lang/String.java    Thu Oct 26 
17:24:42 2017 -0700
@@ -2664,6 +2664,7 @@
       * point</a> is passed through uninterpreted.
       *
       * @return an IntStream of char values from this sequence
+     * @since 9
       */
      @Override
      public IntStream chars() {
@@ -2683,6 +2684,7 @@
       * {@code int} values which are then passed to the stream.
       *
       * @return an IntStream of Unicode code points from this sequence
+     * @since 9
       */
      @Override
      public IntStream codePoints() {