docs: Added documentation for fastIntervalSearch setting

[pirvtech]

This is a documentation PR for the fastIntervalSearch feature merged in 19138

This PR has:

• [] been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• a release note entry in the PR description.
• 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.

[pirvtech]

@kfaraz This is documentation for fastIntervalSearch, please see.

[FrankChen021]

I have reviewed the documentation against the implemented configuration behavior and surrounding code; no issues found.

Reviewed 1 of 1 changed files.

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This is an automated review by Codex GPT-5.6-Sol