NIFI-13217 Adjust JavaDoc of ProcessSession to align with changed standard implementation

[EndzeitBegins]

Summary

Adjusts the JavaDoc of ProcessSession to align with the changes introduced to the standard implementation with NIFI-13200 / #8791.
This behavioral change might surprise users thus it seems sensible to adjust the JavaDoc with a notice accordingly.

NIFI-13217

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• Apache NiFi Jira issue created

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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

UI Contributions

• NiFi is modernizing its UI. Any contributions that update the current UI also need to be implemented in the new UI.

Licensing

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Documentation

• Documentation formatting appears as expected in rendered files

[exceptionfactory]

Thanks for the documentation updates @EndzeitBegins! +1 merging