Fix typo in tests

features/admin/users.feature

@@ -13,4 +13,4 @@ Feature: Admin Users
     And Input non ascii char in username
     And Click save
     Then See username error message
-    And Not chenged form action url
+    And Not changed form action url

features/steps/admin/admin_users.rb

@@ -28,7 +28,7 @@ class AdminUsers < Spinach::FeatureSteps
     end
   end
 
-  And 'Not chenged form action url' do
+  And 'Not changed form action url' do
     page.should have_selector %(form[action="/admin/users/#{@user.username}"])
   end
 end