fix: correct duplicate parameter in signature verification table

[Kropiunig]

Summary

• Fixed duplicate encodeData entry in the signature verification parameter table
• Replaced the second encodeData row with the missing payload parameter and added its description linking to the PayloadStruct section

Fixes #430

Summary by CodeRabbit

• Documentation
  • Clarified documentation for the payload parameter, specifying it contains ABI-encoded Merkle proof and conditional order data.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: afd0bea4-2a57-45b6-a1d8-d9a8f1fde41e

📥 Commits

Reviewing files that changed from the base of the PR and between 99b2eb7 and 3afbe7c.

📒 Files selected for processing (1)

• docs/cow-protocol/reference/contracts/periphery/composable_cow.md

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📝 Walkthrough

Walkthrough

The documentation table for isValidSafeSignature parameters in the Composable Cow contract reference was corrected. A duplicated encodeData row was removed and replaced with a proper payload parameter description documenting the ABI-encoded PayloadStruct data.

Changes

Cohort / File(s)	Summary
Documentation Fix docs/cow-protocol/reference/contracts/periphery/composable_cow.md	Removed duplicate encodeData parameter row and added payload parameter description documenting ABI-encoded PayloadStruct containing Merkle proof, conditional order parameters, and off-chain input.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

Hop hop, a doc so fine,
The table's fixed, now it will shine!
No more duplicates in sight,
The payload's here, all proper and right! 🐰✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change—removing a duplicate parameter entry and correcting the documentation table.
Description check	✅ Passed	The description covers the key changes made and references the linked issue, though it lacks detailed context and a structured changelog section.
Linked Issues check	✅ Passed	The PR successfully addresses the requirements from issue #430: it removes the duplicate encodeData entry and documents the missing payload parameter.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to fixing the documentation issue described in issue #430; no extraneous modifications are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Kropiunig]

I have read the CLA Document and I hereby sign the CLA