docs: fix typo in install.md

[jsjoeio]

No description provided.

[github-actions]

✨ code-server docs for PR #5529 is ready! It will be updated on every commit.

• Host: https://coder.com/docs/code-server/8171c73
• Last deploy status: success
• Commit: b3a49f1
• Workflow status: https://github.com/coder/code-server/actions/runs/2975136557

[codecov]

Codecov Report

Merging #5529 (b3a49f1) into main (4e9ed56) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5529   +/-   ##
=======================================
  Coverage   72.44%   72.44%           
=======================================
  Files          30       30           
  Lines        1673     1673           
  Branches      366      366           
=======================================
  Hits         1212     1212           
  Misses        398      398           
  Partials       63       63           

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[github-actions]

✨ code-server dev build published to npm for PR #5529!

• Last publish status: success
• Commit: b3a49f1

To install in a local project, run:

npm install @coder/code-server-pr@5529

To install globally, run:

npm install -g @coder/code-server-pr@5529