Reworded the explanation about Symfony installation

javiereguiluz · javiereguiluz · commit bd7fdd040f04 · 2015-07-07T11:59:52.000+02:00
diff --git a/quick_tour/the_big_picture.rst b/quick_tour/the_big_picture.rst
@@ -13,9 +13,9 @@ Symfony. If not, welcome to a whole new way of developing web applications.
 Installing Symfony
 ------------------
 
-See the Installtion Manual. :doc:`/book/installation`.
-
-After you have successfully run the welcome page, read the follows.
+Before continuing reading this chapter, make sure to have installed both PHP
+and Symfony as explained in the :doc:`installation chapter </book/installation>`
+of the Symfony book.
 
 Understanding the Fundamentals
 ------------------------------
