Refactor to remove reference to postcss-resolve-nested-selector

[romainmenke]

Which issue, if any, is this issue related to?

None

Is there anything in the PR that needs further explanation?

This rule no longer uses postcss-resolve-nested-selector directly.

Removing this part of the comment to:

• make it easier to search for "postcss-resolve-nested-selector" and get relevant results
• avoid confusion after the planned changes to flattenNestedSelectorsForRule in a later major

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Latest commit: f39c60f

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