docs: fix wallet docs snippet

[Torres-ssf]

• Closes Fix Code Snippet in Mnemonic Wallet Documentation #3654

Checklist

• All changes are covered by tests (or not applicable)
• All changes are documented (or not applicable)
• I reviewed the entire PR myself (preferably, on GH UI)
• I described all Breaking Changes (or there's none)

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
fuels-template	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 17, 2025 1:07am
ts-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 17, 2025 1:07am
ts-docs-api	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 17, 2025 1:07am

[github-actions]

Coverage Report:

Lines	Branches	Functions	Statements
77.12%(-0.03%)	70.79%(+0.1%)	75.27%(-0.03%)	77.12%(-0.03%)

Changed Files:

Ok	File (✨=New File)	Lines	Branches	Functions	Statements
🔴	✨ packages/abi-coder/src/utils/scriptData.ts	0% (+0%)	0% (+0%)	0% (+0%)	0% (+0%)
🔴	packages/account/src/providers/provider.ts	67.53% (+0.58%)	59.8% (+2.73%)	68.04% (+0%)	67.29% (+0.56%)
🔴	packages/errors/src/test-utils/expect-to-throw-fuel-error.ts	91.66% (-0.34%)	88.88% (+0%)	100% (+0%)	91.66% (-0.34%)