chore: Update docs:dev script filter to point to the correct documentation site path (#11551)
### Description
<!--
✍️ Write a short summary of your work.
If necessary, include relevant screenshots.
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Hello Turborepo team,
I am a frequent user of your project and really appreciate your work. I
found an error in the docs execution script within package.json and have
submitted a fix.
<img width="644" height="141" alt="Screenshot 2026-01-25 at 10 03 40 PM"
src="https://github.com/user-attachments/assets/fb0f8065-da3f-491c-842f-ba2fb4cb638a"
/>