[hotfix] [docs] Correct inaccurate description of JobMaster's role in Flink JobManager

[qiaqialuguo]

What is the purpose of the change

This pull request corrects an inaccurate translation in the documentation regarding the role of JobMaster in Flink's architecture. The current documentation implies that JobManager supervises the execution of individual tasks, whereas it is actually the JobMaster, as a component within the JobManager, that is responsible for overseeing the execution of tasks for a single job.

Brief change log

• Updated the documentation to clarify that the JobMaster supervises the tasks for a single job, rather than implying that the JobManager itself manages each task.

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): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no

[flinkbot]

CI report:

• f4bd7b4 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

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

[JingGe]

LGTM

[davidradl]

@qiaqialuguo CI is failing.

[qiaqialuguo]

@flinkbot run azure

[davidradl]

@qiaqialuguo CI is failing - maybe a rebase might help? Failing that raise a CI issue - as it seems unrelated to your change.

[davidradl]

Reviewed by Chi on 05/12/24. Asked submitter questions . sorting out the CI test then LGTM

[qiaqialuguo]

@flinkbot run azure

[qiaqialuguo]

@qiaqialuguo CI is failing - maybe a rebase might help? Failing that raise a CI issue - as it seems unrelated to your change.

Thanks for the suggestion, @davidradl! Rebase was helpful.