[FLINK-21122][docs] Update checkpoint_monitoring.zh.md

[yuruguo]

What is the purpose of the change

Update checkpoint_monitoring.zh.md

Brief change log

• Update docs/ops/monitoring/checkpoint_monitoring.zh.md

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

Documentation

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

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Automated Checks

Last check on commit 6fead85 (Fri May 28 08:06:47 UTC 2021)

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[RocMarshal]

@yuruguo Thanks for the contribution, left some minor comments. please take a look.

[RocMarshal]

Suggested change

	注意，对于失败的 checkpoint，指标会被尽最大努力进行更新并且可能不准确。
	注意，对于失败的 checkpoint，指标会尽最大努力进行更新，但是可能不准确。

[yuruguo]

Nice, I think your translation is better. Can you @wuchong take a look？THX!

[wuchong]

Yes. I think so.

[wuchong]

LGTM.

[wuchong]

LGTM.

[wuchong]

LGTM.