[hotfix][javadocs] Updated javadoc to refer to pom.xml file

[mans2singh]

What is the purpose of the change

• The quickstart main class javadoc refers to POM.xml file.

Brief change log

• Updated javadoc to refer to pom.xml file to be consistent with the references to the file

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? not applicable

[flinkbot]

CI report:

• d2e2294 Azure: SUCCESS

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Automated Checks

Last check on commit d2e2294 (Sun Jan 16 01:29:33 UTC 2022)

Warnings:

• No documentation files were touched! Remember to keep the Flink docs up to date!

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Review Progress

• ❓ 1. The [description] looks good.
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• ❓ 3. Needs [attention] from.
• ❓ 4. The change fits into the overall [architecture].
• ❓ 5. Overall code [quality] is good.

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