feature symfony#8357 Added a Troubleshooting section to the main deployment article (javiereguiluz)

This PR was squashed before being merged into the 3.3 branch (closes symfony#8357).

Discussion
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Added a Troubleshooting section to the main deployment article

This fixes symfony#8298. This must go to 3.3 because that's the first Symfony version affected by this issue.

Commits
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3d6b7eb Added a help note about glob patterns
2be4c1d Minor changes
86ccbdf Added a Troubleshooting section to the main deployment article

Author: weaverryan

deployment.rst

@@ -208,7 +208,35 @@ Don't forget that deploying your application also involves updating any dependen
 (typically via Composer), migrating your database, clearing your cache and
 other potential things like pushing assets to a CDN (see `Common Post-Deployment Tasks`_).
 
-.. _`Git Tagging`: https://git-scm.com/book/en/v2/Git-Basics-Tagging
+Troubleshooting
+---------------
+
+Deployments not Using the ``composer.json`` File
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Symfony applications provide a ``kernel.project_dir`` parameter and a related
+:method:`Symfony\\Component\\HttpKernel\\Kernel\\Kernel::getProjectDir>` method.
+You can use this method to perform operations with file paths relative to your
+project's root directory. The logic to find that project root directory is based
+on the location of the main ``composer.json`` file.
+
+If your deployment method doesn't use Composer, you may have removed the
+``composer.json`` file and the application won't work on the production server.
+The solution is to override the ``getProjectDir()`` method in the application
+kernel and return your project's root directory::
+
+    // app/AppKernel.php
+    // ...
+    class AppKernel extends Kernel
+    {
+        // ...
+
+        public function getProjectDir()
+        {
+            return __DIR__.'/..';
+        }
+    }
+
 .. _`Capifony`: https://github.com/everzet/capifony
 .. _`Capistrano`: http://capistranorb.com/
 .. _`sf2debpkg`: https://github.com/liip/sf2debpkg
@@ -220,3 +248,4 @@ other potential things like pushing assets to a CDN (see `Common Post-Deployment
 .. _`Redis`: http://redis.io/
 .. _`Symfony plugin`: https://github.com/capistrano/symfony/
 .. _`Deployer`: http://deployer.org/
+.. _`Git Tagging`: https://git-scm.com/book/en/v2/Git-Basics-Tagging

service_container.rst

@@ -229,6 +229,11 @@ each time you ask for it.
             // $this is a reference to the current loader
             $this->registerClasses($definition, 'AppBundle\\', '../../src/AppBundle/*', '../../src/AppBundle/{Entity,Repository}');
 
+    .. tip::
+
+        The value of the ``resource`` and ``exclude`` options can be any valid
+        `glob pattern`_.
+
     Thanks to this configuration, you can automatically use any classes from the
     ``src/AppBundle`` directory as a service, without needing to manually configure
     it. Later, you'll learn more about this in :ref:`service-psr4-loader`.