Adding a link to the Doctrine chapter per a comment from @rpmsk

weaverryan · weaverryan · commit 893199cc4887 · 2013-01-20T15:32:40.000-06:00
diff --git a/book/from_flat_php_to_symfony2.rst b/book/from_flat_php_to_symfony2.rst
@@ -580,7 +580,7 @@ them for you. Here's the same sample application, now built in Symfony2::
         }
     }
 
-The two controllers are still lightweight. Each uses the Doctrine ORM library
+The two controllers are still lightweight. Each uses the :doc:`Doctrine ORM library</book/doctrine>`
 to retrieve objects from the database and the ``Templating`` component to
 render a template and return a ``Response`` object. The list template is
 now quite a bit simpler:

Original file line number	Diff line number	Diff line change
`@@ -580,7 +580,7 @@ them for you. Here's the same sample application, now built in Symfony2::`
`580`	`580`	`}`
`581`	`581`	`}`
`582`	`582`
`583`		`-The two controllers are still lightweight. Each uses the Doctrine ORM library`
	`583`	+The two controllers are still lightweight. Each uses the :doc:`Doctrine ORM library</book/doctrine>`
`584`	`584`	to retrieve objects from the database and the ``Templating`` component to
`585`	`585`	render a template and return a ``Response`` object. The list template is
`586`	`586`	`now quite a bit simpler:`