Fix invalid WETH address and wrong BNB explorer links in competition rules

[KaiserSnipes]

Description

Two link fixes in the competition rules baseline-token sections. The Base chain baseline links WETH to 0x420000000000000000000000000000000000000, which is 39 hex characters and not a valid address. The BNB chain baseline's four explorer links point at bnbscan.com rather than the canonical BNB Chain explorer (bscscan.com).

Changes

• Base baseline: corrected the WETH link target to the canonical Base WETH 0x4200000000000000000000000000000000000006 (on-chain symbol() returns WETH).
• BNB baseline: replaced bnbscan.com with bscscan.com in four links. The addresses themselves are unchanged.

Summary by CodeRabbit

• Documentation
  • Updated the Base chain WETH address reference to the canonical address.
  • Corrected BNB chain token links to use BscScan.

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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 Plus

Run ID: 31a9eaa2-553e-4a9b-97a6-0ee85938f286

📥 Commits

Reviewing files that changed from the base of the PR and between b5c361d and ef46752.

📒 Files selected for processing (1)

• docs/cow-protocol/reference/core/auctions/competition_rules.md

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📝 Walkthrough

Walkthrough

The competition rules documentation now uses the canonical Base WETH address and bscscan.com for BNB chain token links.

Changes

Token link corrections

Layer / File(s)	Summary
Update chain token links docs/cow-protocol/reference/core/auctions/competition_rules.md	The Base WETH link uses the canonical address ending in 0006. BNB token links use bscscan.com while preserving their addresses.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: harisang, pretf00d, raq0x

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes both link corrections made in the competition rules.
Description check	✅ Passed	The description includes the required sections and clearly explains the reasons and details for each link correction.
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.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[KaiserSnipes]

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