ENGCOM-3995: Static test fix.

Author: p-bystritsky

app/code/Magento/Customer/Block/Adminhtml/Edit/DeleteButton.php

@@ -10,6 +10,7 @@
 
 /**
  * Class DeleteButton
+ *
  * @package Magento\Customer\Block\Adminhtml\Edit
  */
 class DeleteButton extends GenericButton implements ButtonProviderInterface
@@ -36,6 +37,8 @@ public function __construct(
     }
 
     /**
+     * Get button data.
+     *
      * @return array
      */
     public function getButtonData()
@@ -60,6 +63,8 @@ public function getButtonData()
     }
 
     /**
+     * Get delete url.
+     *
      * @return string
      */
     public function getDeleteUrl()

app/code/Magento/Customer/Block/Adminhtml/Edit/InvalidateTokenButton.php

@@ -9,11 +9,14 @@
 
 /**
  * Class InvalidateTokenButton
+ *
  * @package Magento\Customer\Block\Adminhtml\Edit
  */
 class InvalidateTokenButton extends GenericButton implements ButtonProviderInterface
 {
     /**
+     * Get button data.
+     *
      * @return array
      */
     public function getButtonData()
@@ -34,6 +37,8 @@ public function getButtonData()
     }
 
     /**
+     * Get invalidate token url.
+     *
      * @return string
      */
     public function getInvalidateTokenUrl()

app/code/Magento/Customer/Controller/Adminhtml/Customer/InvalidateToken.php

@@ -7,6 +7,7 @@
 
 namespace Magento\Customer\Controller\Adminhtml\Customer;
 
+use Magento\Framework\App\Action\HttpGetActionInterface;
 use Magento\Integration\Api\CustomerTokenServiceInterface;
 use Magento\Customer\Api\AccountManagementInterface;
 use Magento\Customer\Api\AddressRepositoryInterface;
@@ -25,7 +26,7 @@
  * @SuppressWarnings(PHPMD.TooManyFields)
  * @SuppressWarnings(PHPMD.NumberOfChildren)
  */
-class InvalidateToken extends \Magento\Customer\Controller\Adminhtml\Index
+class InvalidateToken extends \Magento\Customer\Controller\Adminhtml\Index implements HttpGetActionInterface
 {
     /**
      * Authorization level of a basic admin session

app/code/Magento/Customer/Controller/Adminhtml/Index/Delete.php

@@ -8,6 +8,9 @@
 use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;
 use Magento\Framework\Controller\ResultFactory;
 
+/**
+ * Delete customer action.
+ */
 class Delete extends \Magento\Customer\Controller\Adminhtml\Index implements HttpPostActionInterface
 {
     /**

app/code/Magento/Customer/Controller/Adminhtml/Index/MassDelete.php

@@ -47,8 +47,7 @@ public function __construct(
     }
 
     /**
-     * @param AbstractCollection $collection
-     * @return \Magento\Backend\Model\View\Result\Redirect
+     * @inheritdoc
      */
     protected function massAction(AbstractCollection $collection)
     {