Merge branch '2.8' into 3.0

* 2.8: (31 commits)
  Adding details about the Symfony framework as comments
  Adjust Application use statement
  replacing with index, otherwise these documents are not included in *any* index
  Error in CSRF example code snippet
  Added missing reference
  Update serializer.rst
  Adding missing link reference for #6877, because someone must have been in a hurry :)
  Remove additional backslash
  Add a class specificity for SplFileInfo
  Update Reference to Service Container Tags
  Remove extra quotes from ExprBuilder::thenInvalid() usage
  Update PropertyAccess Component Path
  Fix Incorrect Indent
  Suggested Changes
  Add PropertyInfo Component Documentation
  missing "`"
  added lyrixx to the core team
  Remove redundant verb
  Removed the "Learn more" section
  Created a "Platform as a Service" section
  ...

Author: weaverryan

_build/redirection_map

@@ -328,4 +328,5 @@
 /components/var_dumper/index /components/var_dumper
 /components/yaml/introduction /components/yaml
 /components/yaml/index /components/yaml
+/deployment/tools /deployment
 /install/bundles /setup/bundles

components/config/definition.rst

@@ -722,7 +722,7 @@ The builder is used for adding advanced validation rules to node definitions, li
                         ->isRequired()
                         ->validate()
                         ->ifNotInArray(array('mysql', 'sqlite', 'mssql'))
-                            ->thenInvalid('Invalid database driver "%s"')
+                            ->thenInvalid('Invalid database driver %s')
                         ->end()
                     ->end()
                 ->end()

components/finder.rst

@@ -41,7 +41,7 @@ directories::
     }
 
 The ``$file`` is an instance of :class:`Symfony\\Component\\Finder\\SplFileInfo`
-which extends :phpclass:`SplFileInfo` to provide methods to work with relative
+which extends PHP's own :phpclass:`SplFileInfo` to provide methods to work with relative
 paths.
 
 The above code prints the names of all the files in the current directory

components/form.rst

@@ -134,7 +134,7 @@ The following snippet adds CSRF protection to the form factory::
 
     $formFactory = Forms::createFormFactoryBuilder()
         // ...
-        ->addExtension(new CsrfExtension($csrfStorage))
+        ->addExtension(new CsrfExtension($csrfManager))
         ->getFormFactory();
 
 Internally, this extension will automatically add a hidden field to every