[FLINK-15849][doc] Update SQL-CLIENT document from type to data-type

[danny0405]

What is the purpose of the change

Fix the SQL-CLI document to use data-type as key for schema fields.

Brief change log

• Fix sqlClient.md and sqlClient.zh.md

Verifying this change

Build local and works ok.

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/Mesos, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no

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Automated Checks

Last check on commit 76c6bca (Wed Jun 10 03:58:19 UTC 2020)

✅no warnings

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• ❓ 5. Overall code [quality] is good.

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CI report:

• 76c6bca Azure: SUCCESS

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