Add links to example dags in use params section

[harjeevanmaan]

closes: #40811

Added the Links and the paragraph about required fields in Params documentation.

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[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)
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[shahar1]

Welcome to Apache Airflow!
Good start, but please take a look at my comment below :)

[boring-cyborg]

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