fixed confusing grammar in the backend formatDate() function

Author: princefishthrower

app/code/Magento/Eav/Model/Entity/Attribute/Backend/Datetime.php

@@ -61,8 +61,8 @@ public function beforeSave($object)
     /**
      * Prepare date for save in DB
      *
-     * string format used from input fields (all date input fields need apply locale settings)
-     * int value can be declared in code (this meen whot we use valid date)
+     * string format is used in input fields (all date input fields need apply locale settings)
+     * int (Unix) format can be used in other parts of the code
      *
      * @param string|int|\DateTimeInterface $date
      * @return string
@@ -72,7 +72,7 @@ public function formatDate($date)
         if (empty($date)) {
             return null;
         }
-        // unix timestamp given - simply instantiate date object
+        // Unix timestamp given - simply instantiate date object
         if (is_scalar($date) && preg_match('/^[0-9]+$/', $date)) {
             $date = (new \DateTime())->setTimestamp($date);
         } elseif (!($date instanceof \DateTimeInterface)) {