remove versionadded directives for Symfony 6

Author: xabbuh

frontend/asset_mapper.rst

@@ -951,10 +951,6 @@ is useful if you want to avoid leaking sensitive files like ``.env`` or
 
 This option is enabled by default.
 
-.. versionadded:: 6.4
-
-    The ``exclude_dotfiles`` option was introduced in Symfony 6.4.
-
 .. _config-importmap-polyfill:
 
 ``framework.asset_mapper.importmap_polyfill``

messenger.rst

@@ -1586,11 +1586,6 @@ sentinel_master          String, if null or empty Sentinel      null
                          support is disabled
 =======================  =====================================  =================================
 
-.. versionadded:: 6.1
-
-    The ``persistent_id``, ``retry_interval``, ``read_timeout``, ``timeout``, and
-    ``sentinel_master`` options were introduced in Symfony 6.1.
-
 .. caution::
 
     There should never be more than one ``messenger:consume`` command running with the same