[Issue] Fix typo in PHPDoc block

[m2-assistant[bot]]

This issue is automatically created based on existing pull request: magento/magento2#38940: Fix typo in PHPDoc block

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Description (*)

This PR remove a unknown referenced variable in PHPDoc for $helper variable declaration.

Manual testing scenarios (*)

This fix has no testing scenario, because is a code typo.

Contribution checklist (*)

• [x] Pull request has a meaningful description of its purpose
• [x] All commits are accompanied by meaningful commit messages
• [ ] All new or changed code is covered with unit/integration tests (if applicable)
• [ ] README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• [ ] All automated tests passed successfully (all builds are green)

[github-jira-sync-bot]

Unfortunately, not enough information was provided to create a Jira ticket. Please make sure you added the following label(s): Reproduced on 2.4.x, ^Area:.*

Once all required labels are present, please add Issue: Confirmed label again.

[github-jira-sync-bot]

:white_check_mark: Jira issue https://jira.corp.adobe.com/browse/AC-13173 is successfully created for this GitHub issue.

[m2-assistant[bot]]

:white_check_mark: Confirmed by @engcom-Dash. Thank you for verifying the issue.
Issue Available: @engcom-Dash, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.