Update Docstrings of Modules with Missing Params

[bryce-lewis]

Added params and descriptions to docstrings to improve documentation of the following modules

• MySqlHook
• RedshiftHook
• CloudSQLHook
• BigQueryHook
• OracleHook
• MongoHook
• HdfsSensor
• ZendeskHook
• ElasticsearchHook

[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/master/CONTRIBUTING.rst)
Here are some useful points:

• Pay attention to the quality of your code (flake8, pylint 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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  In case of doubts contact the developers at:
  Mailing List: dev@airflow.apache.org
  Slack: https://s.apache.org/airflow-slack

[sunkickr]

Looks like there are some trailing white spaces that need cleaned up

[boring-cyborg]

Awesome work, congrats on your first merged pull request!