[hotfix][docs] replace deprecated class and fix typos

[JingGe]

What is the purpose of the change

Replace deprecated class, update doc, and fix typos

Brief change log

• Refactoring - replace the deprecated ParquetAvroWriters with the AvroParquetWriters
• Update doc to use AvroParquetWriters
• typos fix in StreamExecutionEnvironment

Verifying this change

This change is a code and doc 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, 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)

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Automated Checks

Last check on commit 55418da (Mon Feb 07 10:59:01 UTC 2022)

Warnings:

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CI report:

• b97b899 Azure: SUCCESS

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LGTM