Update Day 1_Data PreProcessing.md

[YeziPeter]

Pull Request Prelude

Thank you for your contribution :)

Please complete the below steps before filing your PR:

I have read and understood CONTRIBUTING document. I have read and understood CODE_OF_CONDUCT document. I have included tests for the changes in my PR. If not, I have included a rationale for why I haven't. I understand my PR may be closed if it becomes obvious I didn't actually perform all of these steps.

Why this change is necessary and useful

[Please explain in detail why the changes in this PR are needed.]

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