[WIP]Add browserkit component documentation

components/browser_kit/index.rst

@@ -0,0 +1,7 @@
+Browser Kit
+====
+
+.. toctree::
+    :maxdepth: 2
+
+    introduction

components/browser_kit/introduction.rst

@@ -0,0 +1,18 @@
+.. index::
+   single: Yaml
+   single: Components; Yaml
+
+The Browser Kit Component
+=========================
+
+    The Browser Kit component simulates the behavior of a web browser.
+
+The Browser Kit component allows you to make web request, click on links and submit forms. 
+
+Installation
+------------
+
+You can install the component in 2 different ways:
+
+* :doc:`Install it via Composer </components/using_components>` (``symfony/browser-kit`` on `Packagist`_);
+* Use the official Git repository (https://github.com/symfony/BrowserKit).

cookbook/event_dispatcher/before_after_filters.rst

@@ -125,7 +125,8 @@ event listeners, you can learn more about them at :doc:`/cookbook/service_contai
             $controller = $event->getController();
 
             /*
-             * $controller passed can be either a class or a Closure. This is not usual in Symfony but it may happen.
+             * $controller passed can be either a class or a Closure.
+             * This is not usual in Symfony but it may happen.
              * If it is a class, it comes in array format
              */
             if (!is_array($controller)) {
@@ -189,7 +190,7 @@ want.
 After Filters with the ``kernel.response`` Event
 ------------------------------------------------
 
-In addition to having a "hook" that's executed before your controller, you
+In addition to having a "hook" that's executed *before* your controller, you
 can also add a hook that's executed *after* your controller. For this example,
 imagine that you want to add a sha1 hash (with a salt using that token) to
 all responses that have passed this token authentication.