RFR (CSR) JDK-8245399 Remove addition preview adornment from String::formatted

[James Laskey]

Thank you Paul. 

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> On May 19, 2020, at 5:41 PM, Paul Sandoz <paul.sandoz at oracle.com> wrote:
> 
> +1
> Paul.
> 
>> On May 19, 2020, at 1:00 PM, Jim Laskey <james.laskey at oracle.com> wrote:
>> 
>> 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>
>> 
>> 
>