Fix missing comma in session config example

[nasty23-star]

Description (required)

https://docs.astro.build/en/guides/sessions/

Problem
In the "Configuring sessions" example, adapter: vercel() is missing a trailing comma before session: {, which makes the snippet invalid JS.

Proposed fix
Add a comma after vercel().

References

• Closes Missing comma in session config example on /en/guides/sessions/ #14646

[astrobot-houston]

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guides/sessions.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[github-actions]

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[ArmandPhilippot]

Nice catch, thank you! And welcome to Docs contributors! 🥳