Improve a comment and docstring about memory profiling

[iliakur]

What does this PR do?

Rewords an inline comment and docstring as follow-up to #20355.

Motivation

• The inline comment shouldn't repeat the code, easier to maintain it that way.
• The test docstring should describe on higher level what the test does.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.32%. Comparing base (c7055fa) to head (fb4daa0).
Report is 1 commits behind head on master.

Additional details and impacted files

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Review from AAraKKe is dismissed. Related teams and files:

• agent-integrations
  • datadog_checks_base/tests/base/checks/test_agent_check.py

[AAraKKe]

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