DOCS-1706 - Document GoTo Search enhancements

[amee-sumo]

Purpose of this pull request

This pull request documents the GoTo Search bar enhancements, including support for searching Library content, Monitors, SLOs, and improved no-match behavior. Adds a service release note and updates the UI reference doc.

Select the type of change

• Minor Changes - Typos, formatting, slight revisions
• Update Content - Revisions, updating sections
• New Content - New features, sections, pages, tutorials
• Site and Tools - .clabot, version updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

Ticket (if applicable)

https://sumologic.atlassian.net/browse/DOCS-1706

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[JV0812]

Reviewed the release note and UI doc update. Anchor link #go-to-menu-options resolves correctly, filename/keyword/date conventions all check out, and content is consistent between the two files. LGTM.

Note: the PR still carries the do-not-merge label — approving the content, but hold the merge until that gate is cleared.