docs: fix prefer-optional-chain example for the unsafe fixes option

[cigui]

…odifyTheReturnTypeIKnowWhatImDoing in prefer-optional-chain

PR Checklist

• Addresses an existing open issue: fixes Docs: [prefer-optional-chain] update docs for the option allowPotentiallyUnsafeFixesThatModifyTheReturnTypeIKnowWhatImDoing #7702
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

The example for the option allowPotentiallyUnsafeFixesThatModifyTheReturnTypeIKnowWhatImDoing seems like a copy-paste error, which has two equal lines calling acceptsBoolean. The second line should be using optional chain.

[typescript-eslint]

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[JoshuaKGoldberg]

Agreed 😄 thanks!