Add content for subscription headless hooks documentation

[Aviatorscode2]

No description provided.

[linear]

MRK-1200 Headless hooks

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch MRK-1200

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[DianaHackmamba]

Just a couple minor edits.

[DianaHackmamba]

Why is subscription capitalized here but not in the description?

[DianaHackmamba]

Suggested change

	If you need to manage a specific subscription instance, use the `useSubscription` hook. It fetches the details and preference states for a single subscription.
	If you need to manage a specific subscription instance, then use the `useSubscription` hook. This hook fetches the details and preference states for a single subscription.