Update shortcuts.mdx

[Dahka2321]

Updated the ENS domain reference link in the Shortcuts documentation.

Changes made:

• Changed the non-functional link https://onlinea.eth to the correct ENS resolver URL https://app.ens.domains/onlinea.eth
• This update ensures users can properly resolve and access the ENS domain
• Improves documentation accuracy and user experience

The old link was not functional as .eth domains cannot be accessed directly through browsers. The new link directs users to the official ENS app where they can properly resolve the ENS domain.

[vercel]

@Dahka2321 is attempting to deploy a commit to the Consensys Team on Vercel.

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