Fix typos in ExecutorServiceParallelExecutor.java

[shunping]

Follow-up with #39096

Same fix has been applied to 2.75 release branch: #39115

[shunping]

r: @Abacn

[gemini-code-assist]

Summary of Changes

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This pull request improves the clarity and accuracy of error reporting within the ExecutorServiceParallelExecutor. By refining the exception message and fixing formatting issues, it ensures that developers receive more precise diagnostic information during executor shutdown failures.

Highlights

• Error message update: Updated the error message text to accurately reflect that the error occurred during executor shutdown rather than general pipeline execution.
• String formatting fix: Corrected the newline character escaping in the exception message to ensure proper formatting when reporting errors.

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[gemini-code-assist]

Code Review

This pull request updates the error message in ExecutorServiceParallelExecutor.java when an exception occurs during executor shutdown. It changes the message text to correctly reflect that the error occurred during executor shutdown rather than pipeline execution, and fixes double-escaped newline characters (\\n to \n). There are no review comments, so I have no feedback to provide.

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