symfony
diff --git a/‎components/phpunit_bridge.rst
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diff --git a/‎mailer.rst
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@@ -311,7 +311,7 @@ Deprecation Notices at Autoloading Time
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 By default, the PHPUnit Bridge uses ``DebugClassLoader`` from the
-:doc:`ErrorHandler component </components/error_handler>`_ to throw deprecation
+:doc:`ErrorHandler component </components/error_handler>` to throw deprecation
 notices at class autoloading time. This can be disabled with the
 ``debug-class-loader`` option.
 
 
@@ -211,7 +211,7 @@ Methods to Change Case
 The methods of all string classes are case-sensitive by default. You can perform
 case-insensitive operations with the ``ignoreCase()`` method::
 
-    u('abc')->indexOf('B');               //  null
+    u('abc')->indexOf('B');               // null
     u('abc')->ignoreCase()->indexOf('B'); // 1
 
 Methods to Append and Prepend
 
@@ -266,6 +266,13 @@ provides access to the original message (``getOriginalMessage()``) and to some
 debug information (``getDebug()``) such as the HTTP calls done by the HTTP
 transports, which is useful to debug errors.
 
+.. note::
+
+    Some mailer providers change the ``Message-Id`` when sending the email. The
+    ``getMessageId()`` method from ``SentMessage`` always returns the definitive
+    ID of the message (being the original random ID generated by Symfony or the
+    new ID generated by the mailer provider).
+
 The exceptions related to mailer transports (those which implement
 :class:`Symfony\\Component\\Mailer\\Exception\\TransportException`) also provide
 this debug information via the ``getDebug()`` method.
 
@@ -784,6 +784,24 @@ you don't need to do *anything*: the service will be automatically loaded. Then,
 implements ``Twig\Extension\ExtensionInterface``. And thanks to ``autowire``, you can even add
 constructor arguments without any configuration.
 
+Linting Service Definitions
+---------------------------
+
+The ``lint:container`` command checks that the arguments injected into services
+match their type declarations. It's useful to run it before deploying your
+application to production (e.g. in your continuous integration server):
+
+.. code-block:: terminal
+
+    $ php bin/console lint:container
+
+Checking the types of all service arguments whenever the container is compiled
+can hurt performance. That's why this type checking is implemented in a
+:doc:`compiler pass </service_container/compiler_passes>` called
+``CheckTypeDeclarationsPass`` which is disabled by default and enabled only when
+executing the ``lint:container`` command. If you don't mind the performance
+loss, enable the compiler pass in your application.
+
 .. _container-public:
 
 Public Versus Private Services