minor #5498 [WIP] Added caution notes about the deprecation of container scopes (javiereguiluz)

This PR was merged into the 2.8 branch.

Discussion
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[WIP] Added caution notes about the deprecation of container scopes

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.8+
| Fixed tickets | #5436

This is a first proposal related to scopes deprecation. Questions:

  * Should we expand the "caution notes" to explain why we did that and the alternatives provided?
  * Should we rewrite the `cookbook/service_container/scopes.rst` article to explain the new scopes + shared flag and add a note about the old scopes which were available in the past Symfony versions?

Commits
-------

99a996c Added caution notes about the deprecation of container scopes

Author: xabbuh

cookbook/console/console_command.rst

@@ -82,6 +82,11 @@ for details.
 Getting Services from the Service Container
 -------------------------------------------
 
+.. caution::
+
+    The "container scopes" concept explained in this section has been deprecated
+    in Symfony 2.8 and it will be removed in Symfony 3.0.
+
 By using :class:`Symfony\\Bundle\\FrameworkBundle\\Command\\ContainerAwareCommand`
 as the base class for the command (instead of the more basic
 :class:`Symfony\\Component\\Console\\Command\\Command`), you have access to the

cookbook/service_container/scopes.rst

@@ -4,6 +4,11 @@
 How to Work with Scopes
 =======================
 
+.. caution::
+
+    The "container scopes" concept explained in this article has been deprecated
+    in Symfony 2.8 and it will be removed in Symfony 3.0.
+
 This article is all about scopes, a somewhat advanced topic related to the
 :doc:`/book/service_container`. If you've ever gotten an error mentioning
 "scopes" when creating services, then this article is for you.