Removed 4.x version added directives

Author: wouterj

service_container/calls.rst

@@ -78,10 +78,6 @@ To configure the container to call the ``setLogger`` method, use the ``calls`` k
         };
 
 
-.. versionadded:: 4.3
-
-    The ``immutable-setter`` injection was introduced in Symfony 4.3.
-
 To provide immutable services, some classes implement immutable setters.
 Such setters return a new instance of the configured class
 instead of mutating the object they were called on::

service_container/injection_types.rst

@@ -108,10 +108,6 @@ then extending it and overriding the constructor becomes problematic.
 Immutable-setter Injection
 --------------------------
 
-.. versionadded:: 4.3
-
-    The ``immutable-setter`` injection was introduced in Symfony 4.3.
-
 Another possible injection is to use a method which returns a separate instance
 by cloning the original service, this approach allows you to make a service immutable::