Fix SDK importJson README example

[ahfoysal]

Summary

• use the supported data option in the JavaScript SDK importJson README example
• fix the misspelled SDK contributing filename

Checks

• pnpm exec prettier --check packages/javascript-sdk/README.md packages/javascript-sdk/CONTRIBUTING.md
• pre-commit hook: typecheck and core Jest suite

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Latest commit: 6598bdb

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[1pxone]

@ahfoysal thank you very much! Good catch