added missing comma

[phamduylong]

Linked Issue

Closes #2221

Description

Added a missing comma in modal documentations example

Changsets

Instructions: Changesets automate our changelog. If you modify files in /packages, run pnpm changeset in the root of the monorepo, follow the prompts, then commit the markdown file. Changes that add features should be minor while chores and bugfixes should be patch. Please prefix the changeset message with feat:, bugfix: or chore:.

Checklist

Please read and apply all contribution requirements.

• This PR targets the dev branch (NEVER master)
• Documentation reflects all relevant changes
• Branch is prefixed with: docs/, feat/, chore/, bugfix/
• Ensure Svelte and Typescript linting is current - run pnpm ci:check
• Ensure Prettier linting is current - run pnpm format
• All test cases are passing - run pnpm test
• Includes a changeset (if relevant; see above)

[vercel]

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Name	Status	Preview	Updated (UTC)
skeleton-docs	✅ Ready (Inspect)	Visit Preview	Nov 7, 2023 7:57pm

[changeset-bot]

⚠️ No Changeset found

Latest commit: 97fed91

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[endigo9740]

This is great, thanks @phamduylong