Typo in nextjs installation instructions. Refers to a jsx file as js file

[daviddkkim]

Please describe your changes

There was a typo in nextjs installation instructions. Refers to a jsx file as js file

How did you accomplish your changes

[add a detailed description of how you accomplished your changes here]

text change

How have you tested your changes

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visually

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Remarks

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Checklist

• [x ] The changes are not breaking the editor
• [ x] Added tests where possible
• [ x] Followed the guidelines
• [x ] Fixed linting issues

Related issues

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[daviddkkim]

@svenadlung Could you review this tiny change to correct the docs?