update dev dependency install instructions

[leightkt]

Description

Updating dev dependency install instructions for sveltekit and vite per exchange: #1645

PLEASE NOTE- Checklist must be complete prior to review.

Checklist

• [NA] Increment the version field in package.json of the package you have made changes in following semantic versioning and using alpha release tagging
• Check the box that allows repo maintainers to update this PR
• [NA] Test locally to make sure this feature/fix works
• Run yarn check-all to confirm there are not any associated errors
• Confirm this PR passes Circle CI checks
• Add or update relevant information in the documentation

Docs Checklist

• Include a screenshot of any changes (see docs README on running locally)
• Add/update the appropriate package README (if applicable)
• [NA] Add/update the related module in the docs demo (if applicable)
• Add/update the related package in the docs/package.json file (if applicable)

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Name	Status	Preview	Updated (UTC)
web3-onboard-docs	✅ Ready (Inspect)	Visit Preview	Apr 17, 2023 11:01pm

[Adamj1232]

Thank you for updating this @leightkt !