minor #9711 Improve functional test workflow example (JeroenDeDauw, javiereguiluz)

This PR was submitted for the master branch but it was merged into the 2.7 branch instead (closes #9711).

Discussion
----------

Improve functional test workflow example

The example used to be Arrange Act Assert Act Assert, rather than http://wiki.c2.com/?ArrangeActAssert

Commits
-------

3c0a54a Reword
36cb8a2 Improve functional test workflow example

Author: javiereguiluz

testing.rst

@@ -124,7 +124,6 @@ application (from the routing to the views). They are no different from unit
 tests as far as PHPUnit is concerned, but they have a very specific workflow:
 
 * Make a request;
-* Test the response;
 * Click on a link or submit a form;
 * Test the response;
 * Rinse and repeat.