docs: restore three-step 7702 undelegation flow

[avarobinson]

Motivation

• Clarify how to remove an EIP-7702 delegation and return an account to a pure EOA by restoring a concise, three-step undelegation flow in second-person wording.
• Make explicit that bundlers cannot relay undelegations and preserve the recommendation to use Viem for signing the authorization.

Description

• Updated fern/wallets/pages/transactions/using-eip-7702/index.mdx to replace the previous paragraph with a clear three-step procedure using second-person phrasing (you).
• The new steps instruct to fund the account with native gas, sign an EIP-7702 authorization delegating to address(0) with currentNonce + 1, and send an empty transaction using currentNonce that includes the authorization.
• Kept the note that bundlers cannot relay undelegations and retained the recommendation to use Viem's signAuthorization with executor: self.

Testing

• Ran eslint --fix as part of pre-commit hooks and it completed successfully.
• Ran prettier --write --log-level silent as part of pre-commit hooks and it completed successfully.

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Codex Task

[github-actions]

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