Merge branch '6.4' into 7.1

* 6.4:
  [Notifier] Misc. minor tweaks

Author: javiereguiluz

notifier.rst

@@ -15,13 +15,15 @@ Get the Notifier installed using:
     $ composer require symfony/notifier
 
 .. _channels-chatters-texters-email-and-browser:
+.. _channels-chatters-texters-email-browser-and-push:
 
-Channels: Chatters, Texters, Email, Browser and Push
-----------------------------------------------------
+Channels
+--------
 
-The notifier component can send notifications to different channels. Each
-channel can integrate with different providers (e.g. Slack or Twilio SMS)
-by using transports.
+Channels refer to the different mediums through which notifications can be delivered.
+These channels include email, SMS, chat services, push notifications, etc. Each
+channel can integrate with different providers (e.g. Slack or Twilio SMS) by
+using transports.
 
 The notifier component supports the following channels:
 
@@ -33,28 +35,23 @@ The notifier component supports the following channels:
 * Browser channel uses :ref:`flash messages <flash-messages>`.
 * :ref:`Push channel <notifier-push-channel>` sends notifications to phones and browsers via push notifications.
 
-.. tip::
-
-    Use :doc:`secrets </configuration/secrets>` to securely store your
-    API tokens.
-
 .. _notifier-sms-channel:
 
 SMS Channel
 ~~~~~~~~~~~
 
+The SMS channel uses :class:`Symfony\\Component\\Notifier\\Texter` classes
+to send SMS messages to mobile phones. This feature requires subscribing to
+a third-party service that sends SMS messages. Symfony provides integration
+with a couple popular SMS services:
+
 .. caution::
 
     If any of the DSN values contains any character considered special in a
     URI (such as ``: / ? # [ ] @ ! $ & ' ( ) * + , ; =``), you must
     encode them. See `RFC 3986`_ for the full list of reserved characters or use the
     :phpfunction:`urlencode` function to encode them.
 
-The SMS channel uses :class:`Symfony\\Component\\Notifier\\Texter` classes
-to send SMS messages to mobile phones. This feature requires subscribing to
-a third-party service that sends SMS messages. Symfony provides integration
-with a couple popular SMS services:
-
 ==================  ====================================================================================================================================
 Service
 ==================  ====================================================================================================================================
@@ -203,6 +200,11 @@ Service
                     **Webhook support**: No
 ==================  ====================================================================================================================================
 
+.. tip::
+
+    Use :doc:`Symfony configuration secrets </configuration/secrets>` to securely
+    store your API tokens.
+
 .. tip::
 
     Some third party transports, when using the API, support status callbacks