[13] RFR (XXS): 8222668: Add @since tag to JapaneseEra.REIWA

[naoto.sato at oracle.com]

Hello,

Please review this trivial change to the following issue:

https://bugs.openjdk.java.net/browse/JDK-8222668

Here is the one line change to add the @since tag:

--- old/src/java.base/share/classes/java/time/chrono/JapaneseEra.java 
2019-04-17 13:38:30.000000000 -0700
+++ new/src/java.base/share/classes/java/time/chrono/JapaneseEra.java 
2019-04-17 13:38:29.000000000 -0700
@@ -154,6 +154,8 @@
       * The singleton instance for the 'Reiwa' era (2019-05-01 - )
       * which has the value 3. The end date of this era is not 
specified, unless
       * the Japanese Government defines it.
+     *
+     * @since 13
       */
      public static final JapaneseEra REIWA = new JapaneseEra(3, 
LocalDate.of(2019, 5, 1));

Naoto