Docs: Improve wording in Helm chart introduction

[dilshadshaik3031]

Improved wording in the Helm chart documentation for clarity.

[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 Contributors' Guide (https://github.com/apache/airflow/blob/main/contributing-docs/README.rst)
Here are some useful points:

• Pay attention to the quality of your code (ruff, mypy and type annotations). Our prek-hooks 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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• Please follow ASF Code of Conduct for all communication including (but not limited to) comments on Pull Requests, Mailing list and Slack.
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• Always keep your Pull Requests rebased, otherwise your build might fail due to changes not related to your commits.
  Apache Airflow is a community-driven project and together we are making it better 🚀.
  In case of doubts contact the developers at:
  Mailing List: dev@airflow.apache.org
  Slack: https://s.apache.org/airflow-slack

[dilshadshaik3031]

Thanks for the review and approval!
It looks like some of the Kubernetes CI checks failed, which may be unrelated to this documentation-only change.
Please let me know if you’d like me to re-run the checks or update anything.

[jscheffl]

Luckily maintainers can re-run failed CI... now green!
Thanks for the docs fixes!

[boring-cyborg]

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

[dilshadshaik3031]

Thank you for re-running the checks and for the review!
Glad the CI passed, and I appreciate the feedback.