docs: fix install.sh link

[jsjoeio]

This PR fixes two broken links for install.sh.

Fixes #4545

[github-actions]

✨ Coder.com for PR #4627 deployed! It will be updated on every commit.

• Host: /docs/code-server
• Last deploy status: skipped
• Commit: b0ebac2
• Workflow status: https://github.com/coder/code-server/actions/runs/1589868032

[jsjoeio]

Verified the fix ✅

https://codercom-dr1r9uyjd-codercom.vercel.app/docs/code-server/latest/install

[codecov]

Codecov Report

Merging #4627 (469e0e2) into main (3059d72) will not change coverage.
The diff coverage is n/a.

❗ Current head 469e0e2 differs from pull request most recent head 1401005. Consider uploading reports for the commit 1401005 to get more accurate results

@@           Coverage Diff           @@
##             main    #4627   +/-   ##
=======================================
  Coverage   66.10%   66.10%           
=======================================
  Files          30       30           
  Lines        1658     1658           
  Branches      337      337           
=======================================
  Hits         1096     1096           
  Misses        477      477           
  Partials       85       85           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 73e0b79...1401005. Read the comment docs.