docs: fix spelling of cluster

[jamesray]

🔗 Linked issue

#719

❓ 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

fix spelling of cluster docs/content/deploy/node

📝 Checklist

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

[codecov]

Codecov Report

Merging #720 (8f51955) into main (463b3e5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #720   +/-   ##
=======================================
  Coverage   66.91%   66.91%           
=======================================
  Files          57       57           
  Lines        4232     4232           
  Branches      459      459           
=======================================
  Hits         2832     2832           
  Misses       1397     1397           
  Partials        3        3           

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