[book][templating] Rewording the section about formatting to be more clear after some changes

Author: weaverryan

book/templating.rst

@@ -419,13 +419,14 @@ that specify the *format* and *engine* for that template.
 * **BlogBundle:Blog:index.css.twig** - CSS format, Twig engine
 
 By default, any Symfony2 template can be written in either Twig or PHP, and
-the second part of the extension specifies which of these two *engines*
-should be used. The first part of the extension, (e.g. HTML, CSS, etc)
-is the finished format that the template will generate. Unlike the engine,
-which determines how Symfony2 parses the template, this is simply an organizational
-tactic used in case the same content ever needs to be rendered as HTML
-(``index.html.twig``), XML (``index.xml.twig``), or any other format.
-For more information, read the :ref:`template-formats` section.
+the last part of the extension (e.g. ``.twig`` or ``.php``) specifies which
+of these two *engines* should be used. The first part of the extension,
+(e.g. ``.html``, ``.css``, etc) is the final format that the template will
+generate. Unlike the engine, which determines how Symfony2 parses the template,
+this is simply an organizational tactic used in case the same resource needs
+to be rendered as HTML (``index.html.twig``), XML (``index.xml.twig``),
+or any other format. For more information, read the :ref:`template-formats`
+section.
 
 .. note::