minor #5955 use single quotes for YAML strings (snoek09)

This PR was squashed before being merged into the 2.3 branch (closes #5955).

Discussion
----------

use single quotes for YAML strings

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | #5935

Commits
-------

81b96b6 use single quotes for YAML strings

Author: xabbuh

best_practices/business-logic.rst

@@ -145,7 +145,7 @@ the class namespace as a parameter:
 
     services:
         app.slugger:
-            class: "%slugger.class%"
+            class: '%slugger.class%'
 
 This practice is cumbersome and completely unnecessary for your own services:
 

best_practices/controllers.rst

@@ -43,7 +43,7 @@ configuration to the main routing configuration file:
 
     # app/config/routing.yml
     app:
-        resource: "@AppBundle/Controller/"
+        resource: '@AppBundle/Controller/'
         type:     annotation
 
 This configuration will load annotations from any controller stored inside the

book/configuration.rst

@@ -21,14 +21,14 @@ format you prefer:
             - { resource: security.yml }
 
         framework:
-            secret:          "%secret%"
-            router:          { resource: "%kernel.root_dir%/config/routing.yml" }
+            secret:          '%secret%'
+            router:          { resource: '%kernel.root_dir%/config/routing.yml' }
             # ...
 
         # Twig Configuration
         twig:
-            debug:            "%kernel.debug%"
-            strict_variables: "%kernel.debug%"
+            debug:            '%kernel.debug%'
+            strict_variables: '%kernel.debug%'
 
         # ...
 
@@ -226,7 +226,7 @@ the configuration file for the ``dev`` environment.
             - { resource: config.yml }
 
         framework:
-            router:   { resource: "%kernel.root_dir%/config/routing_dev.yml" }
+            router:   { resource: '%kernel.root_dir%/config/routing_dev.yml' }
             profiler: { only_exceptions: false }
 
         # ...

book/doctrine.rst

@@ -64,11 +64,11 @@ information. By convention, this information is usually configured in an
             # app/config/config.yml
             doctrine:
                 dbal:
-                    driver:   "%database_driver%"
-                    host:     "%database_host%"
-                    dbname:   "%database_name%"
-                    user:     "%database_user%"
-                    password: "%database_password%"
+                    driver:   '%database_driver%'
+                    host:     '%database_host%'
+                    dbname:   '%database_name%'
+                    user:     '%database_user%'
+                    password: '%database_password%'
 
         .. code-block:: xml
 
@@ -162,7 +162,7 @@ for you:
             doctrine:
                 dbal:
                     driver: pdo_sqlite
-                    path: "%kernel.root_dir%/sqlite.db"
+                    path: '%kernel.root_dir%/sqlite.db'
                     charset: UTF8
 
         .. code-block:: xml

book/page_creation.rst

@@ -477,14 +477,14 @@ is ``app/config/config.yml``:
         # ...
 
         framework:
-            secret: "%secret%"
+            secret: '%secret%'
             router:
-                resource: "%kernel.root_dir%/config/routing.yml"
+                resource: '%kernel.root_dir%/config/routing.yml'
             # ...
 
         twig:
-            debug:            "%kernel.debug%"
-            strict_variables: "%kernel.debug%"
+            debug:            '%kernel.debug%'
+            strict_variables: '%kernel.debug%'
 
         # ...
 

book/routing.rst

@@ -168,7 +168,7 @@ file:
         # app/config/config.yml
         framework:
             # ...
-            router: { resource: "%kernel.root_dir%/config/routing.yml" }
+            router: { resource: '%kernel.root_dir%/config/routing.yml' }
 
     .. code-block:: xml
 
@@ -1181,7 +1181,7 @@ configuration:
 
         # app/config/routing.yml
         app:
-            resource: "@AppBundle/Controller/"
+            resource: '@AppBundle/Controller/'
             type:     annotation # required to enable the Annotation reader for this resource
 
     .. code-block:: xml
@@ -1232,7 +1232,7 @@ directory are parsed and put into the routing.
 
             # app/config/routing.yml
             app:
-                resource: "@AcmeOtherBundle/Resources/config/routing.yml"
+                resource: '@AcmeOtherBundle/Resources/config/routing.yml'
 
         .. code-block:: xml
 
@@ -1271,7 +1271,7 @@ suppose you want to prefix all routes in the AppBundle with ``/site`` (e.g.
 
         # app/config/routing.yml
         app:
-            resource: "@AppBundle/Controller/"
+            resource: '@AppBundle/Controller/'
             type:     annotation
             prefix:   /site
 

book/service_container.rst

@@ -259,8 +259,8 @@ parameter and uses it in the service definition.
 
         # app/config/parameters.yml
         parameters:
-            # This will be parsed as string "@securepass"
-            mailer_password: "@@securepass"
+            # This will be parsed as string '@securepass'
+            mailer_password: '@@securepass'
 
 .. note::
 
@@ -398,7 +398,7 @@ configuration.
 
         # app/config/config.yml
         imports:
-            - { resource: "@AcmeHelloBundle/Resources/config/services.yml" }
+            - { resource: '@AcmeHelloBundle/Resources/config/services.yml' }
 
     .. code-block:: xml
 
@@ -475,7 +475,7 @@ invokes the service container extension inside the FrameworkBundle:
             secret:          xxxxxxxxxx
             form:            true
             csrf_protection: true
-            router:        { resource: "%kernel.root_dir%/config/routing.yml" }
+            router:        { resource: '%kernel.root_dir%/config/routing.yml' }
             # ...
 
     .. code-block:: xml

book/translation.rst

@@ -615,7 +615,7 @@ not empty, add the following:
         AppBundle\Entity\Author:
             properties:
                 name:
-                    - NotBlank: { message: "author.name.not_blank" }
+                    - NotBlank: { message: 'author.name.not_blank' }
 
     .. code-block:: xml
 

book/validation.rst

@@ -302,7 +302,7 @@ rules). In order to validate an object, simply map one or more constraints
 to its class and then pass it to the ``validator`` service.
 
 Behind the scenes, a constraint is simply a PHP object that makes an assertive
-statement. In real life, a constraint could be: "The cake must not be burned".
+statement. In real life, a constraint could be: 'The cake must not be burned'.
 In Symfony, constraints are similar: they are assertions that a condition
 is true. Given a value, a constraint will tell you if that value
 adheres to the rules of the constraint.
@@ -639,7 +639,7 @@ this method must return ``true``:
         AppBundle\Entity\Author:
             getters:
                 passwordLegal:
-                    - "True": { message: "The password cannot match your first name" }
+                    - 'True': { message: 'The password cannot match your first name' }
 
     .. code-block:: xml
 
@@ -945,8 +945,8 @@ username and the password are different only if all other validation passes
                 - Strict
             getters:
                 passwordLegal:
-                    - "True":
-                        message: "The password cannot match your username"
+                    - 'True':
+                        message: 'The password cannot match your username'
                         groups: [Strict]
             properties:
                 username:

components/dependency_injection/advanced.rst

@@ -128,4 +128,4 @@ service by asking for the ``bar`` service like this::
         services:
            foo:
              class: Example\Foo
-           bar: "@foo"
+           bar: '@foo'