Update comment to match code

[fredden]

Description

Per https://github.com/magento/ece-tools/issues/791, the comment in this class does not match the code's behaviour. This pull request fixes that.

Fixed Issues (if relevant)

1. Fixes https://github.com/magento/ece-tools/issues/791

Manual testing scenarios

This is a documentation change - no code testing is required.

Release notes

None

Associated documentation updates

None

Contribution checklist

• [x] Pull request has a meaningful description of its purpose
• [x] Pull request introduces user-facing changes and includes meaningful updates for any required release notes and documentation changes
• [x] All commits are accompanied by meaningful commit messages
• [x] All new or changed code is covered with unit/integration tests (if applicable)
• [x] All automated tests passed successfully (all builds on Travis CI are green)