NIFI-13565 Reworded DATE_FORMAT, TIME_FORMAT and TIMESTAMP_FORMAT to indicate they use the DateTimeFormatter format and not the SimpleDateFormat.

[dan-s1]

Summary

NIFI-13565

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• Pull Request title starts with Apache NiFi Jira issue number, such as NIFI-00000
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Build

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  • JDK 21

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Documentation

• Documentation formatting appears as expected in rendered files

[exceptionfactory]

Thanks for the update @dan-s1! +1 merging