[Forwardport] PHPDoc

[lfluvisotto]

Original Pull Request

#16215

Description

PHPDoc in methods that were missing

[magento-engcom-team]

Hi @lfluvisotto. Thank you for your contribution
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[VladimirZaets]

Hi, @lfluvisotto , I took your PR into processing, thank you for collaboration.

[VladimirZaets]

@lfluvisotto The phpdoc was be added to test fixture file. This led to failing InterfaceGeneratorTest test. I fixed it.

[magento-engcom-team]

Hi @lfluvisotto. Thank you for your contribution.
We will aim to release these changes as part of 2.3.0.
Please check the release notes for final confirmation.