[D1] Fix "Starter code for D1 Sessions API demo" link in read-replication.mdx

[benjs04]

Summary

Added "template" suffix and changed branch to main in d1 sessions demo link.

Related to cloudflare/templates/pull/387.

Documentation checklist

I believe none of them apply to this.

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PR Change Summary

Updated the D1 Sessions API demo link to point to the correct branch and added a template suffix.

• Changed the D1 Sessions API demo link to use the main branch
• Added 'template' suffix to the demo link

Modified Files

• src/content/docs/d1/best-practices/read-replication.mdx

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