Remove unused versionadded directives

Author: OskarStark

reference/configuration/framework.rst

@@ -2713,10 +2713,6 @@ A map with default context options that will be used with each ``serialize`` and
 call. This can be used for example to set the json encoding behavior by setting ``json_encode_options``
 to a `json_encode flags bitmask`_.
 
-.. versionadded:: 5.4
-
-    The ``default_context`` parameter was introduced in Symfony 5.4.
-
 php_errors
 ~~~~~~~~~~
 

service_container/service_decoration.rst

@@ -527,10 +527,6 @@ The result will be::
 
     The ``Baz`` frame id will now be ``.decorated_foo_stack.second``.
 
-.. versionadded:: 5.1
-
-    The ability to define ``stack`` was introduced in Symfony 5.1.
-
 Control the Behavior When the Decorated Service Does Not Exist
 --------------------------------------------------------------