Update create-a-prompt-template-imperative-92453a7.md

[MatKuhr]

Remove unnecessary / incorrect header from example

[cla-assistant]

All committers have signed the CLA.

[schthms]

thank you!

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[karu-0711]

Thanks for your feedback, @MatKuhr. We've updated the documentation and the change will be published on the SAP Help Portal soon.