fix error handling and documentation formatting

[maximevtush]

What changed? Why?

• Updated error message formatting in alreadyClaimedName.ts for consistency
• Fixed documentation formatting in cross-chain messages markdown file to properly display code references
  These changes improve code readability and maintain consistent error handling patterns across the codebase

Notes to reviewers:

• Minor formatting changes only
• No functional changes to the core logic
• Focus on documentation and error message consistency

How has it been tested?

• Verified error handling flow remains unchanged
• Confirmed documentation renders correctly
• No additional tests needed as changes are cosmetic

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
web-base-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 21, 2025 10:43am

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[vercel]

@maximevtush is attempting to deploy a commit to the Coinbase Team on Vercel.

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[wbnns]

ACK

@maximevtush Thanks for contributing and for building on Base 🔵