bug symfony#8875 Update the_architecture.rst (obax)

This PR was merged into the 4.0 branch.

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Update the_architecture.rst

This article confused me looking at Symfony 4. I hope my changes are correct.

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8ce10b8 Update the_architecture.rst

Author: weaverryan

quick_tour/the_architecture.rst

@@ -13,8 +13,12 @@ Understanding the Directory Structure
 The directory structure of a Symfony application is rather flexible, but the
 recommended structure is as follows:
 
-``app/``
-    The application configuration, templates and translations.
+``config/``
+    The application configuration
+``templates/``
+    The application's views
+``translations/``
+    The home of translation files
 ``bin/``
     Executable files (e.g. ``bin/console``).
 ``src/``