fix: indentation for list items in reviewing-prs.md

[dkarczmarski]

it seems that there is an error with the indentation of two list items.

after the sentence :

- We are willing to mirror any blog article that was published to https://kubernetes.dev/blog/ (the contributor blog) provided that:

the three next points refer to that sentence,
so they should have the same indentation,
but the first one is not indented and it is the same level as the main sentence.

the second error is about the sentence starting with :

  - You should set the canonical URL for the mirrored article, to the URL of the original article

it looks like it refers to the main sentence, but it seems it should not.

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