[Issue] Fix misleading phpdocs return types for Customer Address

[m2-assistant]

This issue is automatically created based on existing pull request: #40649: Fix misleading phpdocs return types for Customer Address

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Description (*)

This PR fixes missleading PHPDocs return types for Customer Address related methods

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-16966 is successfully created for this GitHub issue.