[FLINK-39282][docs] Translate "Balanced Tasks Scheduling" page into Chinese

[Vincent-Woo]

What is the purpose of the change

Translate "Balanced Tasks Scheduling" page into Chinese.
The page url is https://nightlies.apache.org/flink/flink-docs-master/zh/docs/deployment/tasks-scheduling/balanced_tasks_scheduling/ .
The markdown file is located in flink/docs/content.zh/docs/deployment/tasks-scheduling/balanced_tasks_scheduling.md .

Brief change log

Translate "Balanced Tasks Scheduling" page into Chinese

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
• If yes, how is the feature documented? not applicable

[flinkbot]

CI report:

• 943ebc5 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

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

[klion26]

Thanks for the contribution, I left some comments, please let know me what do you think about them, thanks.

[Vincent-Woo]

@klion26 Thanks for the review, I've optimized the areas mentioned.

[klion26]

Thanks for addressing the comments, LGTM, let's see if there are any other comments from the community.

The rendered content looks like below