Fix doc about search query

[FrankChen021]

Fixes #10610

Description

granularity property for a search query is not required based on the code which was introduced by #5157 .

This problem only exists for search query while the doc for other queries such as time-series query or group-by query is OK.

This PR fixes the doc to keep it in coincidence with the code.

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This PR has:

• been self-reviewed.
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.

[nishantmonu51]

👍