Fixes to chain strategy example in outlier_reduction.md

[reuning]

What does this PR do?

The chain strategies example in the outlier reduction has new_topics being acted on in the first step and then topics acted on in the second step. I'm pretty sure this is supposed to be other way around. This fixes that.

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• This PR fixes a typo or improves the docs (if yes, ignore all other checks!).
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• Did you write any new necessary tests?

[MaartenGr]

Yep, you are completely right! Thank you for the PR 😄