Change read_time_pct / write_time_pct description because they are kept for backward compatibility.

[masafm]

What does this PR do?

Change read_time_pct / write_time_pct description because they are kept for backward compatibility as described in the code comment.

Motivation

Since this file serves as the basis for customer-facing documentation, any inaccuracies could lead to confusion. In case 1901092, the customer inquired if the values for read_time_pct and write_time_pct might be incorrect.

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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.76%. Comparing base (33de32f) to head (1bbe50c).

Additional details and impacted files

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