[Forwordport2.2] Fix incorrect type hinting in PHPDocs

[chirag-wagento]

Original Pull Request

#15619

Description

Incorrect PHPdoc causes warnings in IDE.

Changes applied:

1. Changed the return type for setQty method to the type it actually returns.
2. Removed the hint for newer thrown LocalizedException in PHPDocs of register and setQty methods.

Fixed Issues

1. Incorrect phpdoc should be Shipment\Item not Invoice\Item #13992: Incorrect phpdoc should be Shipment\Item not Invoice\Item

Manual testing scenarios

1. This is not necessary, this just resolves warnings in the IDE.

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)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @chirag-wagento. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
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[osrecio]

Closing this PR. Check trace of Commits and create new PR with cherrypick commits

[chirag-wagento]

Hello @osrecio

Sorry not getting you can you please explain me in brief.

Thanks