removed docs on PHP parsing in YAML files

Author: fabpot

components/yaml/introduction.rst

@@ -134,20 +134,6 @@ string or a file containing YAML. Internally, it calls the
 :method:`Symfony\\Component\\Yaml\\Parser::parse` method, but enhances the
 error if something goes wrong by adding the filename to the message.
 
-Executing PHP Inside YAML Files
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-.. versionadded:: 2.1
-    The ``Yaml::enablePhpParsing()`` method is new to Symfony 2.1. Prior to 2.1,
-    PHP was *always* executed when calling the ``parse()`` function.
-
-By default, if you include PHP inside a YAML file, it will not be parsed.
-If you do want PHP to be parsed, you must call ``Yaml::enablePhpParsing()``
-before parsing the file to activate this mode. If you only want to allow
-PHP code for a single YAML file, be sure to disable PHP parsing after parsing
-the single file by calling ``Yaml::$enablePhpParsing = false;`` (``$enablePhpParsing``
-is a public property).
-
 Writing YAML Files
 ~~~~~~~~~~~~~~~~~~