Update the doc block comment at AdvancedEmailWebformValidatorHandler for "validateEmail" method

Problem/Motivation

Inside of class

AdvancedEmailWebformValidatorHandler

there is a method called "validateEmail" and the doc block can be improved following the recommendations. For example "Missing parameter comment" and about If there is no return value for a function, there must not be a @return tag.

Steps to reproduce

Run code sniffers to get the results of:

FILE: advanced_email_validation/src/Plugin/WebformHandler/AdvancedEmailWebformValidatorHandler.php
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FOUND 3 ERRORS AFFECTING 2 LINES
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 233 | ERROR | Missing parameter comment
 235 | ERROR | If there is no return value for a function, there must not be a @return tag.
 235 | ERROR | Description for the @return value is missing
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Time: 292ms; Memory: 10MB

Proposed resolution

Update this adding the description in the doc block and adjust the return tag

Remaining tasks

User interface changes

API changes

Data model changes