Please review this change to remove the preview heading from the javadoc of String::formatted. This also updates the @since to 15.
Thank you. Cheers, -- Jim csr: https://bugs.openjdk.java.net/browse/JDK-8245399 <https://bugs.openjdk.java.net/browse/JDK-8245399> jbs: https://bugs.openjdk.java.net/browse/JDK-8245398 <https://bugs.openjdk.java.net/browse/JDK-8245398>
