[Issue] Fix return type in phpdoc

[m2-assistant]

This issue is automatically created based on existing pull request: #37881: Fix return type in phpdoc

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Description (*)

The method does return a \Magento\Sales\Api\Data\OrderItemInterface and it should be typed as such. \Magento\Sales\Model\Order::getItems is called to get the item and in its phpdoc the return type is \Magento\Sales\Api\Data\OrderItemInterface[], so it only makes sense to return \Magento\Sales\Api\Data\OrderItemInterface it in these methods

Fixed Issues (if relevant)

No Issue created.

Manual testing scenarios (*)

No manual testing steps necessary this should be logical in the review.

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• 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]

✅ Jira issue https://jira.corp.adobe.com/browse/AC-17314 is successfully created for this GitHub issue.