docs: Reword comparison between React authoring and CSS authoring

[hidde]

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Motivation

This sentence contrasts authoring React with authoring CSS. The previous version did this in a way that makes the React authoring seem like a more advanced activity (“actual (…) code”), and authoring CSS the less advanced (described as “playing with”). The rewording tries to address that.

Test Plan

Test links

Deploy preview: https://deploy-preview-9247--docusaurus-2.netlify.app/docs/swizzling/

Related issues/PRs

Fixes #9246

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[hidde]

(Checked “Code change” and “New API” checkboxes as they don't apply)

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/docs/installation	🟠 75	🟢 98	🟢 92	🟢 100	🟠 89	Report

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[Josh-Cena]

We do indeed imply that authoring React is a more advanced use case than authoring CSS, based on our experience with community support (most have some sense of CSS but some have trouble writing sensible React). I agree this looks more neutral while keeping the same information :)