[hotfix] fix some typos

[leesf]

What is the purpose of the change

Fix some typos.

Brief change log

Fix some typos.

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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• ❌ 1. The [description] looks good.
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[StefanRRichter]

Thanks for fixing the typos, LGTM 👍 Will merge.