Document more thoroughly the use case for useContent with current page's headings

[AdrianRomanski]

What is it?

• Docs / tests / types / typos

Description

Checklist

• My code follows the developer guidelines of this project
• I performed a self-review of my own code
• I added a changeset with pnpm change
• I made corresponding changes to the Qwik docs
• I added new tests to cover the fix / functionality

[changeset-bot]

⚠️ No Changeset found

Latest commit: f7ad2cb

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[wmertens]

@AdrianRomanski LGTM, why do you have it in draft?

[AdrianRomanski]

@wmertens Changed it :) Thank you for reminder!

[wmertens]

LGTM 🐙