fix contract subscriptions info on features

[Yash094]

Problem solved

Short description of the bug fixed or feature added
Contract subscriptions are enabled by default now.

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PR-Codex overview

This PR updates the content in the page.mdx file related to Contract Subscriptions. It removes a callout about the feature being in early access and adds context regarding the utility of receipts in tracking onchain transaction details.

Detailed summary

• Added explanation that a receipt contains onchain details for transactions, useful for tracking onchain failures.
• Removed the callout about Contract Subscriptions being in early access and the contact link for enabling the feature.

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Latest commit: b03fc8a

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