Correct docs for multi-value select

[jamesqo]

The correct attribute name is examples, not example.

[boring-cyborg]

Congratulations on your first Pull Request and welcome to the Apache Airflow community! If you have any issues or are unsure about any anything please check our Contribution Guide (https://github.com/apache/airflow/blob/main/CONTRIBUTING.rst)
Here are some useful points:

• Pay attention to the quality of your code (ruff, mypy and type annotations). Our pre-commits will help you with that.
• In case of a new feature add useful documentation (in docstrings or in docs/ directory). Adding a new operator? Check this short guide Consider adding an example DAG that shows how users should use it.
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• Be patient and persistent. It might take some time to get a review or get the final approval from Committers.
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• Always keep your Pull Requests rebased, otherwise your build might fail due to changes not related to your commits.
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  In case of doubts contact the developers at:
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[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.

[jedcunningham]

Thanks @jamesqo! Congrats on your first commit 🎉