minor symfony#7805 [Validator] Added array validation example to raw values (CoolGoose, javiereguiluz, wouterj)

This PR was merged into the 2.7 branch.

Discussion
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[Validator] Added array validation example to raw values

This example was removed from the component's README and it has some value imo.

Finishes symfony#7161

Commits
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06f67b4 Moved array validation to the Raw values sub-guide
64f5ad9 Fixed some syntax issues
c8b6b45 missing constraint example from the old readme

Author: xabbuh

components/validator.rst

@@ -46,6 +46,8 @@ characters long::
         }
     }
 
+The validator returns the list of violations.
+
 Retrieving a Validator Instance
 -------------------------------
 

validation/raw_values.rst

@@ -46,12 +46,34 @@ looks like this::
         // ...
     }
 
-By calling ``validate`` on the validator, you can pass in a raw value and
+By calling ``validate()`` on the validator, you can pass in a raw value and
 the constraint object that you want to validate that value against. A full
 list of the available constraints - as well as the full class name for each
 constraint - is available in the :doc:`constraints reference </reference/constraints>`
 section.
 
+Validation of arrays is possible using the ``Collection`` constraint::
+
+    use Symfony\Component\Validator\Validation;
+    use Symfony\Component\Validator\Constraints as Assert;
+
+    $validator = Validation::createValidator();
+
+    $constraint = new Assert\Collection(array(
+        // the keys correspond to the keys in the input array
+        'name' => new Assert\Collection(array(
+          'first_name' => new Assert\Length(array('min' => 101)),
+          'last_name' => new Assert\Length(array('min' => 1)),
+        )),
+        'email' => new Assert\Email(),
+        'simple' => new Assert\Length(array('min' => 102)),
+        'gender' => new Assert\Choice(array(3, 4)),
+        'file' => new Assert\File(),
+        'password' => new Assert\Length(array('min' => 60)),
+    ));
+
+    $violations = $validator->validateValue($input, $constraint);
+
 The ``validate()`` method returns a :class:`Symfony\\Component\\Validator\\ConstraintViolationList`
 object, which acts just like an array of errors. Each error in the collection
 is a :class:`Symfony\\Component\\Validator\\ConstraintViolation` object,