phpdoc fix return type

[maslii]

Description (*)
Fixed phpdoc comment return type in the Customer Account CreatePost controller.

Fixed Issues (if relevant)

1. magento/magento2#<issue_number>: Issue title

Manual testing scenarios (*)

Questions or comments

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]

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[okorshenko]

Hi @maslii
Could you please sign Adobe CLA so that we can proceed with PR acceptance

[maslii]

Signed

[magento-engcom-team]

Hi @okorshenko, thank you for the review.
ENGCOM-6457 has been created to process this Pull Request

[m2-assistant]

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