Add David as codeowner of deployment docs

[neverett]

What changes were proposed in this pull request?

Adds @davidmirror-ops as codeowner of deployment guide docs so he is added as a reviewer on PRs for them.

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.35%. Comparing base (197ae13) to head (8165b4d).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5841      +/-   ##
==========================================
+ Coverage   34.48%   36.35%   +1.86%     
==========================================
  Files        1138     1304     +166     
  Lines      102742   110148    +7406     
==========================================
+ Hits        35434    40043    +4609     
- Misses      63634    65938    +2304     
- Partials     3674     4167     +493     

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	55.60% <ø> (ø)
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.21% <ø> (?)
unittests-flyteidl	7.17% <ø> (ø)
unittests-flyteplugins	53.35% <ø> (ø)
unittests-flytepropeller	42.02% <ø> (ø)
unittests-flytestdlib	55.37% <ø> (+0.02%)	⬆️

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[davidmirror-ops]

Thank you!