[hotfix][docs] Fix alias of Kinesis Data Streams/Firehose and add mis…

[dannycranmer]

…sing stsEndpoint option for Firehose

What is the purpose of the change

Docs hotfix

Brief change log

• Fixed aliases for Kinesis Data Streams/Firehose
• Added missing stsEndpoint option for Kinesis Data Firehose added in FLINK-29496

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? n/a

[flinkbot]

CI report:

• 265500c Azure: SUCCESS

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