[FLINK-12137][Documentation] Add more proper explanation on flink streaming connectors

[yjk891]

What is the purpose of the change

I write on more proper explanation on AWS flink streaming connectors

Brief change log

**

• Change into SuperClass Config options which prevent IntelliJ from showing warning message

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, Yarn/Mesos, 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 documented)

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Review Progress

• ✅ 1. The [description] looks good.
  • Approved by @fhueske [PMC]
• ✅ 2. There is [consensus] that the contribution should go into to Flink.
  • Approved by @fhueske [PMC]
• ❓ 3. Needs [attention] from.
• ✅ 4. The change fits into the overall [architecture].
  • Approved by @fhueske [PMC]
• ❓ 5. Overall code [quality] is good.

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[fhueske]

Hi @yjk891, thanks for your PR!
The changes look good.

@flinkbot approve description consensus architecture quality

I'll merge this PR.
Thanks, Fabian

[yjk891]

Thanks for acceptance my PR and the review