[PCX-21881] Document product family filter and multi-subscription support

[ryan-noel-2258]

Summary

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[cloudflare-docs-bot]

Review

⚠️ 1 warning, 💡 1 suggestion found in commit 94a7f6d.

Code Review

This code review is in beta and may not always be helpful — use your judgment.

_{No code review issues found.}

Conventions

Checks PR title, description, and redirect checklist.

Warnings (1)

File	Issue
PR	Description explains the work — The PR description is identical to the template and the Summary section is empty, providing no explanation of the change. Fix: Add a human-written summary describing what the PR does.

Style Guide Review

Suggestions (1)

File	Issue
billing/manage/billable-usage.mdx line 57	Bullet lists with fewer than three items — Added list has only two items: - \*\*Product family\*\* and - \*\*Product\*\* Fix: Consider rewriting the two filter descriptions as prose instead of a bulleted list.

Redirects

_{No missing redirect entries found.}

Commands

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/disable-auto-review	Stops automatic reviews from triggering on future pushes to this PR. Codeowners can still run /review or /full-review manually.

[zqamruddin]

Good to go!