Changed spelling

Author: Rubinum

testing.rst

@@ -158,7 +158,7 @@ As an example, a test could look like this::
     
 .. tip::
 
-    Do not forget to require the ``Browser-Kit`` via ``composer require browser-kit`` if you want to use the ``WebTestCase`` class.
+    Do not forget to require the ``browser-kit`` component via ``composer require browser-kit``, if you want to use the ``WebTestCase`` class.
 
 .. tip::