[FLINK-32968][table] Fix doc for catalog modification listener

[FangYongs]

What is the purpose of the change

Fix doc for catalog modification listener

Brief change log

• Fix doc for catalog modification listener

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no) no
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no) no
• The serializers: (yes / no / don't know) no
• The runtime per-record code paths (performance sensitive): (yes / no / don't know) no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / no / don't know) no
• The S3 file system connector: (yes / no / don't know) no

Documentation

• Does this pull request introduce a new feature? (yes / no) no
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

[FangYongs]

@PatrickRen @ruanhang1993 Please help to review this PR, thanks

[flinkbot]

CI report:

• 635cf02 Azure: SUCCESS
• eab8a9d Azure: PENDING

Bot commands

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• @flinkbot run azure re-run the last Azure build

[hackergin]

@FangYongs Thank you for your contribution. I only have one minor comment.