Update guard_authentication.rst

Remove marketese

Author: ThomasLandauer

security/guard_authentication.rst

@@ -4,18 +4,15 @@
 Custom Authentication System with Guard (API Token Example)
 ===========================================================
 
-Whether you need to build a traditional login form, an API token authentication system
-or you need to integrate with some proprietary single-sign-on system, the Guard
-component will be the right choice!
-
 Guard authentication can be used to:
 
-* :doc:`Build a Login Form </security/form_login_setup>`,
-* Create an API token authentication system (done on this page!)
-* `Social Authentication`_ (or use `HWIOAuthBundle`_ for a robust, but non-Guard solution)
+* :doc:`Build a Login Form </security/form_login_setup>`
+* Create an API token authentication system (see below)
+* `Social Authentication`_ (or use `HWIOAuthBundle`_ for a robust non-Guard solution)
+* Integrate with some proprietary single-sign-on system
 
-or anything else. In this example, we'll build an API token authentication
-system so we can learn more about Guard in detail.
+and many more. In this example, we'll build an API token authentication
+system, so we can learn more about Guard in detail.
 
 Step 1) Prepare your User Class
 -------------------------------