[Yaml] marked some classes as being internal

src/Symfony/Component/Yaml/Escaper.php

@@ -16,6 +16,8 @@ namespace Symfony\Component\Yaml;
  * YAML strings.
  *
  * @author Matthew Lewinski <matthew@lewinski.org>
+ *
+ * @internal
  */
 class Escaper
 {

src/Symfony/Component/Yaml/Inline.php

@@ -204,6 +204,8 @@ class Inline
      * @return string A YAML string
      *
      * @throws ParseException When malformed inline YAML string is parsed
+     *
+     * @internal
      */
     public static function parseScalar($scalar, $delimiters = null, $stringDelimiters = array('"', "'"), &$i = 0, $evaluate = true, $references = array())
     {

src/Symfony/Component/Yaml/Unescaper.php

@@ -16,6 +16,8 @@ namespace Symfony\Component\Yaml;
  * YAML strings.
  *
  * @author Matthew Lewinski <matthew@lewinski.org>
+ *
+ * @internal
  */
 class Unescaper
 {