docs: FAQ: N update cycles in a ring table

[jjbrosnan]

This adds a FAQ page about a question posed to Raffi by Marshall recently.

[github-actions]

Deploying docs previews for d69d95a (available for 14 days)

Python

[Copilot]

Pull Request Overview

This PR adds a new FAQ page documenting how to capture the first row of the last N update cycles from a blink table into a ring table. The documentation addresses a specific community question about working with blink tables and ring tables in Deephaven.

Key changes:

• Creates comprehensive FAQ documentation with code examples
• Adds navigation entry for the new FAQ page
• Includes visual demonstration with a GIF asset

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
docs/python/sidebar.json	Adds navigation entry for the new FAQ page
docs/python/reference/community-questions/blink-ring.md	Creates the main FAQ documentation with detailed explanation and code example
docs/python/assets/reference/faq/blink-ring.gif	Adds visual demonstration asset

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