magento/magento2: fixes PHPDocs for module Magento_reports

[andrewbess]

Description (*)

This PR fixes the wrong types in PHPDocs and adds the necessary throws

Questions or comments

• The wrong types in the PHPDocs can be confusing for the developer

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 are green)

[m2-assistant]

Hi @andrewbess. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento give me test instance - deploy test instance based on PR changes
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[rogyar]

Failing tests are not related to the change provided in the current PR

[magento-engcom-team]

Hi @rogyar, thank you for the review.
ENGCOM-7182 has been created to process this Pull Request

[engcom-Bravo]

✔️ QA Passed

[engcom-Echo]

Failed static tests not related to the changes in this PR

[m2-assistant]

Hi @andrewbess, thank you for your contribution!
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