minor #4831 Update override.rst (ifdattic)

This PR was merged into the 2.3 branch.

Discussion
----------

Update override.rst

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3
| Fixed tickets |

Commits
-------

44b1584 Update override.rst
cc5564e Update override.rst

Author: weaverryan

cookbook/bundles/override.rst

@@ -23,7 +23,7 @@ the routes from any bundle, then they must be manually imported from somewhere
 in your application (e.g. ``app/config/routing.yml``).
 
 The easiest way to "override" a bundle's routing is to never import it at
-all. Instead of importing a third-party bundle's routing, simply copying
+all. Instead of importing a third-party bundle's routing, simply copy
 that routing file into your application, modify it, and import it instead.
 
 Controllers
@@ -68,7 +68,7 @@ in the core FrameworkBundle:
         $container->setParameter('translator.class', 'Acme\HelloBundle\Translation\Translator');
 
 Secondly, if the class is not available as a parameter, you want to make sure the
-class is always overridden when your bundle is used, or you need to modify
+class is always overridden when your bundle is used or if you need to modify
 something beyond just the class name, you should use a compiler pass::
 
     // src/Acme/DemoBundle/DependencyInjection/Compiler/OverrideServiceCompilerPass.php
@@ -106,7 +106,7 @@ Forms
 -----
 
 In order to override a form type, it has to be registered as a service (meaning
-it is tagged as "form.type"). You can then override it as you would override any
+it is tagged as ``form.type``). You can then override it as you would override any
 service as explained in `Services & Configuration`_. This, of course, will only
 work if the type is referred to by its alias rather than being instantiated,
 e.g.::
@@ -136,7 +136,7 @@ the constraints to a new validation group:
     .. code-block:: yaml
 
         # src/Acme/UserBundle/Resources/config/validation.yml
-        Fos\UserBundle\Model\User:
+        FOS\UserBundle\Model\User:
             properties:
                 plainPassword:
                     - NotBlank:
@@ -152,10 +152,17 @@ the constraints to a new validation group:
         <?xml version="1.0" encoding="UTF-8" ?>
         <constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-            xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping http://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">
+            xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping
+                http://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">
+
+            <class name="FOS\UserBundle\Model\User">
+                <property name="plainPassword">
+                    <constraint name="NotBlank">
+                        <option name="groups">
+                            <value>AcmeValidation</value>
+                        </option>
+                    </constraint>
 
-            <class name="Fos\UserBundle\Model\User">
-                <property name="password">
                     <constraint name="Length">
                         <option name="min">6</option>
                         <option name="minMessage">fos_user.password.short</option>