Fix typo reversed/reserved

[clamoriniere]

What does this PR do?

Fix typo reversed/reserved

Motivation

This typo was reported in DataDog/helm-charts#239

Additional Notes

Anything else we should know when reviewing?

Describe your test plan

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

[codecov-commenter]

Codecov Report

Merging #302 (6d3638b) into main (5b6aa3e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #302   +/-   ##
=======================================
  Coverage   58.18%   58.18%           
=======================================
  Files          59       59           
  Lines        6294     6294           
=======================================
  Hits         3662     3662           
  Misses       2362     2362           
  Partials      270      270           

Flag	Coverage Δ
unittests	58.18% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
api/v1alpha1/datadogmetric_types.go	100.00% <ø> (ø)

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