doc: Only admin password in Tails Greeter.

wiki/src/doc/first_steps/startup_options/administration_password.mdwn

@@ -20,7 +20,8 @@ greeter</span>|startup_options#index2h1]].
 1.  When <span class="application">Tails greeter</span> appears, in the
 <span class="guilabel">Welcome to Tails</span> window, click on the
 <span class="button">Yes</span> button. Then click on the
-<span class="button">Forward</span> button to set more options.
+<span class="button">Forward</span> button to switch to the
+<span class="guilabel">Administration password</span> window.
 
 2.  In the <span class="guilabel">Administration password</span> window, specify
 a password of your choice in both the <span class="guilabel">Password</span> and