Removed "encryption" and "auth_mode" from the list of %env()% compatible options

Author: javiereguiluz

reference/configuration/swiftmailer.rst

@@ -239,10 +239,9 @@ the information will be available in the profiler.
 
 .. tip::
 
-    The following configuration options are compatible with ``%env()%`` parameters:
-    ``url``, ``transport``, ``username``, ``password``, ``host``,
-    ``port``, ``timeout``, ``source_ip``, ``local_domain``,
-    ``encryption``, ``auth_mode``.
+    The following options can be set via environment variables using the
+    ``%env()%`` syntax: ``url``, ``transport``, ``username``, ``password``,
+    ``host``, ``port``, ``timeout``, ``source_ip``, ``local_domain``.
     For details, see the :doc:`/configuration/external_parameters` article.
 
 Full Default Configuration