docs: sync immediatelyExecute documentation with schema clarification

[claude]

Summary

• Add Info note in quote-system.mdx explaining immediatelyExecute source type requirements
• Fix fiat-crypto-conversion.mdx example to use internal account source (was incorrectly using customerId source which is incompatible with immediatelyExecute)
• Add Info note in fiat-crypto-conversion.mdx about source requirements

Context

Schema clarification was added in f3325bf stating that immediatelyExecute can only be used for quotes with a source that is either:

• An internal account, OR
• An external account with direct pull functionality (e.g., ACH pull)

This PR syncs the Mintlify documentation with that schema change.

Test plan

• Verify quote-system.mdx renders correctly with the new Info block
• Verify fiat-crypto-conversion.mdx example is syntactically correct
• Verify Info blocks display properly in Mintlify preview

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR syncs the Mintlify documentation with the schema clarification from f3325bf. The changes correctly document that immediatelyExecute can only be used with sources that are either internal accounts or external accounts with direct pull functionality.

Key changes:

• Fixed fiat-crypto-conversion.mdx example that was incorrectly using customerId source (incompatible with immediatelyExecute)
• Changed example to use proper internal account source with sourceType: "ACCOUNT" and accountId
• Added Info blocks in both files clarifying the source type requirements
• Properly formatted with backticks to prevent platform interpretation of @ symbols

The updated example now matches the pattern used consistently across other documentation files (rewards/quickstart.mdx, rewards/platform-tools/sandbox-testing.mdx, etc.).

Confidence Score: 5/5

• This PR is safe to merge - documentation-only changes with proper formatting
• Documentation changes correctly sync with schema update. The fixed example prevents user confusion by showing the correct source type for immediatelyExecute. All formatting follows Mintlify standards with proper backtick usage.
• No files require special attention

Important Files Changed

Filename	Overview
mintlify/platform-overview/core-concepts/quote-system.mdx	Added Info block clarifying immediatelyExecute source requirements - matches schema documentation
mintlify/ramps/conversion-flows/fiat-crypto-conversion.mdx	Fixed example to use internal account source (previously used incompatible customerId source) and added Info block

_{Last reviewed commit: b9655af}