docs: add NGN and CAD external account examples

[claude]

Summary

• Add Nigeria (NGN) and Canada (CAD) tabs to external accounts documentation
• Update account-model.mdx with NGN_ACCOUNT and CAD_ACCOUNT examples
• Add validation examples for NGN and CAD account number formats

This syncs documentation with the schema changes from c172a95 (feat: add NGN and CAD external account and beneficiary schemas).

Test plan

• Verify external-accounts.mdx renders correctly with new tabs
• Verify account-model.mdx shows NGN and CAD account type examples
• Confirm validation code examples are accurate

🤖 Generated with Claude Code

Mintlify

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[greptile-apps]

Greptile Summary

Adds documentation for Nigerian (NGN) and Canadian (CAD) external account types to sync with schema changes from #226.

• Adds NGN and CAD tabs to account-model.mdx with correctly formatted account type examples
• Adds Nigeria and Canada tabs to external-accounts.mdx with complete cURL API examples including beneficiary details
• Adds validation code for NGN (10-digit account numbers) and CAD (3-digit bank code, 5-digit branch code, 7-12 digit account number) formats
• All examples match the OpenAPI schema patterns and required fields
• Follows existing documentation structure and Mintlify component usage

Confidence Score: 5/5

• Documentation-only change with accurate examples that correctly match the schema definitions
• All account examples follow the exact patterns defined in the OpenAPI schemas, validation code uses correct regex patterns, and the changes follow existing documentation structure and style guide requirements
• No files require special attention

Important Files Changed

Filename	Overview
mintlify/platform-overview/core-concepts/account-model.mdx	Adds NGN and CAD tabs with correctly formatted account type examples matching schema
mintlify/snippets/external-accounts.mdx	Adds Nigeria and Canada tabs with complete API examples and validation code

_{Last reviewed commit: b5df8d5}