Fix GovernorCrosschain README cross-reference

[daixihegu]

Fixes #????

Fix a typo in the Governance README that pointed the GovernorCrosschain description to {CrosschainRemoteExector}.

The correct contract name is {CrosschainRemoteExecutor}, matching the crosschain API docs and the contract declaration.

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

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Latest commit: 3bf0b36

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Reviewing files that changed from the base of the PR and between 20fc52e and 3bf0b36.

📒 Files selected for processing (1)

• contracts/governance/README.adoc

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Walkthrough

contracts/governance/README.adoc updates the GovernorCrosschain documentation to spell CrosschainRemoteExecutor correctly instead of CrosschainRemoteExector.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the README cross-reference typo fix for GovernorCrosschain.
Description check	✅ Passed	The description directly matches the README typo correction and explains the contract name fix.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[daixihegu]

/changeset add --empty

[daixihegu]

@Amxx @ernestognw Hi, Could you please review this PR at your convenience? Thank you very much.