Update step-1-hello-world-typescript-c20489e.md

[soheiiilst]

Added missed comma

[cla-assistant]

All committers have signed the CLA.

[KvM2]

Hi @soheiiilst , thanks for your contribution! We'll look into it and get back to you.

[sap-doc-bot]

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[KlattG]

Fixed with the next release.