docs: update quickstart/index.mdx

[morinokami]

Description

• Rename the variable e to event in the code sample to conform to the jsx-callback-arg-name rule
• Correct the path to the Greet component to match the path instructed to create this component

[changeset-bot[bot]]

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Latest commit: 4ebe5b9f69d13ffe822dbf57387205b4651591eb

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[samijaber]

Thanks!