Add container autoscaling as codeowners for kubectl plugin doc

[khewonc]

What does this PR do?

Add container autoscaling as codeowners for kubectl plugin doc

Motivation

#2678 adds autoscaling commands to doc

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

Write there any instructions and details you may have to test your PR.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label
• All commits are signed (see: signing commits)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.83%. Comparing base (052c983) to head (8b47227).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2699   +/-   ##
=======================================
  Coverage   38.83%   38.83%           
=======================================
  Files         307      307           
  Lines       26599    26599           
=======================================
  Hits        10329    10329           
  Misses      15490    15490           
  Partials      780      780           

Flag	Coverage Δ
unittests	38.83% <ø> (ø)

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