fix error in `guide/en/using-validator.md`

[olegbaturin]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Fixed issues	-

[what-the-diff[bot]]

PR Summary

• Revision of Class Responsibilities The specific change in this request redefines the responsibility of the PersonRulesProvider class, in particular eliminating its connection to the RulesProviderInterface. In a non-technical sense, this update is akin to altering a job role at a company, by decreasing the tasks it was assigned to do.

[arogachev]

Thanks!