doc: fix typo: LockRegistrty -> LockRegistry

[sshine]

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• I found a typo.

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[artembilan]

@pivotal-cla This is an Obvious Fix

[pivotal-cla]

@sshine This Pull Request contains an obvious fix. Signing the Contributor License Agreement is not necessary.

[artembilan]

@sshine ,
Thank you for contribution; looking forward for more!
Please, pay attention in future what commit message should look like: https://github.com/spring-projects/spring-integration/blob/main/CONTRIBUTING.adoc#provide-a-link-to-the-github-issue-in-the-associated-pull-request.