[Issue] Fix a few typos in PHPDoc comments

[m2-assistant]

This issue is automatically created based on existing pull request: #38809: Fix a few typos in PHPDoc comments

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Description (*)

Fix a few typos in PHPDoc comments:

\Magento\ConfigurableProduct\Block\Product\View\Type::_getAdditionalConfig()
\Magento\ConfigurableProduct\Block\Adminhtml\Product\Composite\Fieldset\Configurable::_getAdditionalConfig()

Manual testing scenarios (*)

N/A

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-15075 is successfully created for this GitHub issue.

[m2-assistant]

✅ Confirmed by @engcom-Bravo. Thank you for verifying the issue.
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