minor #11412 small constraint improvements (OskarStark)

This PR was merged into the master branch.

Discussion
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small constraint improvements

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Commits
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b3b39b0 small constraint improvements

Author: javiereguiluz

reference/constraints/Json.rst

@@ -35,7 +35,7 @@ The ``Json`` constraint can be applied to a property or a "getter" method:
              *     message = "You've entered an invalid Json."
              * )
              */
-             private $chapters;
+            private $chapters;
         }
 
     .. code-block:: yaml
@@ -74,8 +74,6 @@ The ``Json`` constraint can be applied to a property or a "getter" method:
 
         class Book
         {
-            private $chapters;
-
             public static function loadValidatorMetadata(ClassMetadata $metadata)
             {
                 $metadata->addPropertyConstraint('chapters', new Assert\Json([

reference/constraints/Timezone.rst

@@ -74,8 +74,6 @@ string meant to contain a timezone identifier (e.g. ``America/New_York``):
 
         class UserSettings
         {
-            protected $timezone;
-
             public static function loadValidatorMetadata(ClassMetadata $metadata)
             {
                 $metadata->addPropertyConstraint('timezone', new Assert\Timezone());