[Validator] add code review fixes

Author: jschaedl

reference/constraints/Negative.rst

@@ -1,6 +1,10 @@
 Negative
 ========
 
+.. versionadded:: 4.3
+
+    The ``Negative`` constraint was introduced in Symfony 4.3.
+
 Validates that a value is a negative number. To force that a value is a negative
 number or equal to zero, see :doc:`/reference/constraints/NegativeOrZero`.
 To force a value is positive, see :doc:`/reference/constraints/Positive`.
@@ -17,22 +21,21 @@ Validator   :class:`Symfony\\Component\\Validator\\Constraints\\LesserThanValida
 Basic Usage
 -----------
 
-The following constraints ensure that:
+The following constraint ensure that:
 
 * the ``withdraw`` of a  bankaccount ``TransferItem`` is a negative number (lesser than zero)
 
 .. configuration-block::
 
     .. code-block:: php-annotations
 
-        // src/Entity/Freezer.php
+        // src/Entity/TransferItem.php
         namespace App\Entity;
 
         use Symfony\Component\Validator\Constraints as Assert;
 
         class TransferItem
         {
-
             /**
              * @Assert\Negative
              */
@@ -74,6 +77,6 @@ The following constraints ensure that:
         {
             public static function loadValidatorMetadata(ClassMetadata $metadata)
             {
-                $metadata->addPropertyConstraint('withdraw', new Assert\Negative;
+                $metadata->addPropertyConstraint('withdraw', new Assert\Negative();
             }
         }

reference/constraints/Positive.rst

@@ -1,6 +1,10 @@
 Positive
 ========
 
+.. versionadded:: 4.3
+
+    The ``Positive`` constraint was introduced in Symfony 4.3.
+
 Validates that a value is a positive number. To force that a value is positive
 number or equal to zero, see :doc:`/reference/constraints/PositiveOrZero`.
 To force a value is negative, see :doc:`/reference/constraints/Negative`.
@@ -17,7 +21,7 @@ Validator   :class:`Symfony\\Component\\Validator\\Constraints\\GreaterThanValid
 Basic Usage
 -----------
 
-The following constraints ensure that:
+The following constraint ensure that:
 
 * the ``income`` of an ``Employee`` is a positive number (greater than zero)
 
@@ -32,7 +36,6 @@ The following constraints ensure that:
 
         class Employee
         {
-
             /**
              * @Assert\Positive
              */
@@ -74,6 +77,6 @@ The following constraints ensure that:
         {
             public static function loadValidatorMetadata(ClassMetadata $metadata)
             {
-                $metadata->addPropertyConstraint('income', new Assert\Positive;
+                $metadata->addPropertyConstraint('income', new Assert\Positive();
             }
         }

reference/constraints/PositiveOrZero.rst

@@ -1,6 +1,10 @@
 PositiveOrZero
 ==============
 
+.. versionadded:: 4.3
+
+    The ``PositiveOrZero`` constraint was introduced in Symfony 4.3.
+
 Validates that a value is a positive number or equal to zero. To force that
 a value is only a positiven umber, see :doc:`/reference/constraints/Positive`.
 To force a value is negative or equal to zero,
@@ -18,7 +22,7 @@ Validator   :class:`Symfony\\Component\\Validator\\Constraints\\GreaterThanOrEqu
 Basic Usage
 -----------
 
-The following constraints ensure that:
+The following constraint ensure that:
 
 * the number of ``siblings`` of a ``Person`` is positive or zero
 
@@ -74,6 +78,6 @@ The following constraints ensure that:
         {
             public static function loadValidatorMetadata(ClassMetadata $metadata)
             {
-                $metadata->addPropertyConstraint('siblings', new Assert\PositiveOrZero);
+                $metadata->addPropertyConstraint('siblings', new Assert\PositiveOrZero();
             }
         }