fix(docs): Added documentation for the comparator version of array_top_n

[allenshen13]

Description

Added documentation for the comparator version of array_top_n.

Motivation and Context

Functionality exists without documentation.

Release Notes

== NO RELEASE NOTE ==

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Documents the comparator-based overload of array_top_n in the array functions reference, filling in previously missing documentation.

File-Level Changes

Change	Details	Files
Document the comparator overload of array_top_n in the array functions reference.	Extend the array_top_n function docs to describe the variant that accepts a comparator argument. Add syntax and parameter description for the comparator version alongside or near the existing array_top_n documentation. Ensure examples and wording clarify the behavior and ordering semantics when a custom comparator is provided.	presto-docs/src/main/sphinx/functions/array.rst

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[steveburnett]

LGTM! (docs)

Pull branch, local doc build, looks good. Thanks!