Remove references to API tagging

Author: dunglas

contributing/code/_api_tagging.rst.inc

@@ -74,8 +74,6 @@ backwards compatibility promise:
 | Add a default value to an argument            | Yes                         |
 +-----------------------------------------------+-----------------------------+
 
-.. include:: _api_tagging.rst.inc
-
 Using our Classes
 ~~~~~~~~~~~~~~~~~
 
@@ -134,8 +132,6 @@ covered by our backwards compatibility promise:
 | Access a private property (via Reflection)    | No                          |
 +-----------------------------------------------+-----------------------------+
 
-.. include:: _api_tagging.rst.inc
-
 Working on Symfony Code
 -----------------------