Merge branch '6.2' into 6.3

* 6.2:
  [Mailer] add more info for debugging
  [HttpCache] Inject $env in example

Author: javiereguiluz

http_cache.rst

@@ -114,7 +114,7 @@ Use the ``framework.http_cache`` option to enable the proxy for the
         // config/packages/framework.php
         use Symfony\Config\FrameworkConfig;
 
-        return static function (FrameworkConfig $framework) use ($env) {
+        return static function (FrameworkConfig $framework, string $env) {
             if ('prod' === $env) {
                 $framework->httpCache()->enabled(true);
             }

mailer.rst

@@ -651,6 +651,12 @@ 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::
+
+    If your code used :class:`Symfony\\Component\\Mailer\\MailerInterface`, you
+    need to replace it by :class:`Symfony\\Component\\Mailer\\Transport\\TransportInterface`
+    to have the ``SentMessage`` object returned.
+
 .. note::
 
     Some mailer providers change the ``Message-Id`` when sending the email. The