📖 Update install-extension.md

[joelanford]

Description

Found one spot we missed on our docs when we changed ClusterExtension.spec.source.catalog.{channel -> channels}

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.36%. Comparing base (a38da78) to head (40b9696).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1741      +/-   ##
==========================================
+ Coverage   68.24%   68.36%   +0.12%     
==========================================
  Files          58       58              
  Lines        4988     4988              
==========================================
+ Hits         3404     3410       +6     
+ Misses       1342     1338       -4     
+ Partials      242      240       -2     

Flag	Coverage Δ
e2e	53.00% <ø> (+0.08%)	⬆️
unit	55.45% <ø> (ø)

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[camilamacedo86]

/lgtm