[FLINK-26052][docs-zh] Document savepoint format

[zoltar9264]

What is the purpose of the change

Update Chinese documentation regarding FLIP-203

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:

• 79f508a Azure: SUCCESS

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[dawidwys]

cc @Myasuka @curcur do you mind taking a look?

[Myasuka]

Thanks for creating this PR!
I think you missed to translate the part of Stopping a Job with Savepoint which also introduce the savepoint format.

[zoltar9264]

Sorry for missed the part of Stopping a Job with Savepoint, the English doc for this part was added after this issue was created, I didn't notice. I will add it soon.

[zoltar9264]

Sorry for missed the part of Stopping a Job with Savepoint, the English doc for this part was added after this issue was created, I didn't notice. I will add it soon.

Done.

[Myasuka]

Please consider the suggestion.

[Myasuka]

LGTM, can you squash all commits into one?

[zoltar9264]

Thanks @Myasuka . Sure, I have done.