docs: fix typo in server assets mount point

[kwarkjes]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[nuxt-studio]

✅ Live Preview ready!

Name	Edit	Preview	Latest Commit
nitro	Edit on Studio ↗︎	View Live Preview	854068e

[codecov]

Codecov Report

Merging #1119 (5274c61) into main (c2e1e7c) will not change coverage.
The diff coverage is n/a.

❗ Current head 5274c61 differs from pull request most recent head 854068e. Consider uploading reports for the commit 854068e to get more accurate results

@@           Coverage Diff           @@
##             main    #1119   +/-   ##
=======================================
  Coverage   67.63%   67.63%           
=======================================
  Files          63       63           
  Lines        6364     6364           
  Branches      711      711           
=======================================
  Hits         4304     4304           
  Misses       2045     2045           
  Partials       15       15           

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